diff options
Diffstat (limited to 'drivers/block/ub.c')
| -rw-r--r-- | drivers/block/ub.c | 2474 |
1 files changed, 0 insertions, 2474 deletions
diff --git a/drivers/block/ub.c b/drivers/block/ub.c deleted file mode 100644 index fcec0225ac76..000000000000 --- a/drivers/block/ub.c +++ /dev/null @@ -1,2474 +0,0 @@ -/* - * The low performance USB storage driver (ub). - * - * Copyright (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net) - * Copyright (C) 2004 Pete Zaitcev (zaitcev@yahoo.com) - * - * This work is a part of Linux kernel, is derived from it, - * and is not licensed separately. See file COPYING for details. - * - * TODO (sorted by decreasing priority) - * -- Return sense now that rq allows it (we always auto-sense anyway). - * -- set readonly flag for CDs, set removable flag for CF readers - * -- do inquiry and verify we got a disk and not a tape (for LUN mismatch) - * -- verify the 13 conditions and do bulk resets - * -- highmem - * -- move top_sense and work_bcs into separate allocations (if they survive) - * for cache purists and esoteric architectures. - * -- Allocate structure for LUN 0 before the first ub_sync_tur, avoid NULL. ? - * -- prune comments, they are too volumnous - * -- Resove XXX's - * -- CLEAR, CLR2STS, CLRRS seem to be ripe for refactoring. - */ -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/usb.h> -#include <linux/usb_usual.h> -#include <linux/blkdev.h> -#include <linux/timer.h> -#include <linux/scatterlist.h> -#include <linux/slab.h> -#include <linux/mutex.h> -#include <scsi/scsi.h> - -#define DRV_NAME "ub" - -#define UB_MAJOR 180 - -/* - * The command state machine is the key model for understanding of this driver. - * - * The general rule is that all transitions are done towards the bottom - * of the diagram, thus preventing any loops. - * - * An exception to that is how the STAT state is handled. A counter allows it - * to be re-entered along the path marked with [C]. - * - * +--------+ - * ! INIT ! - * +--------+ - * ! - * ub_scsi_cmd_start fails ->--------------------------------------\ - * ! ! - * V ! - * +--------+ ! - * ! CMD ! ! - * +--------+ ! - * ! +--------+ ! - * was -EPIPE -->-------------------------------->! CLEAR ! ! - * ! +--------+ ! - * ! ! ! - * was error -->------------------------------------- ! --------->\ - * ! ! ! - * /--<-- cmd->dir == NONE ? ! ! - * ! ! ! ! - * ! V ! ! - * ! +--------+ ! ! - * ! ! DATA ! ! ! - * ! +--------+ ! ! - * ! ! +---------+ ! ! - * ! was -EPIPE -->--------------->! CLR2STS ! ! ! - * ! ! +---------+ ! ! - * ! ! ! ! ! - * ! ! was error -->---- ! --------->\ - * ! was error -->--------------------- ! ------------- ! --------->\ - * ! ! ! ! ! - * ! V ! ! ! - * \--->+--------+ ! ! ! - * ! STAT !<--------------------------/ ! ! - * /--->+--------+ ! ! - * ! ! ! ! - * [C] was -EPIPE -->-----------\ ! ! - * ! ! ! ! ! - * +<---- len == 0 ! ! ! - * ! ! ! ! ! - * ! was error -->--------------------------------------!---------->\ - * ! ! ! ! ! - * +<---- bad CSW ! ! ! - * +<---- bad tag ! ! ! - * ! ! V ! ! - * ! ! +--------+ ! ! - * ! ! ! CLRRS ! ! ! - * ! ! +--------+ ! ! - * ! ! ! ! ! - * \------- ! --------------------[C]--------\ ! ! - * ! ! ! ! - * cmd->error---\ +--------+ ! ! - * ! +--------------->! SENSE !<----------/ ! - * STAT_FAIL----/ +--------+ ! - * ! ! V - * ! V +--------+ - * \--------------------------------\--------------------->! DONE ! - * +--------+ - */ - -/* - * This many LUNs per USB device. - * Every one of them takes a host, see UB_MAX_HOSTS. - */ -#define UB_MAX_LUNS 9 - -/* - */ - -#define UB_PARTS_PER_LUN 8 - -#define UB_MAX_CDB_SIZE 16 /* Corresponds to Bulk */ - -#define UB_SENSE_SIZE 18 - -/* - */ -struct ub_dev; - -#define UB_MAX_REQ_SG 9 /* cdrecord requires 32KB and maybe a header */ -#define UB_MAX_SECTORS 64 - -/* - * A second is more than enough for a 32K transfer (UB_MAX_SECTORS) - * even if a webcam hogs the bus, but some devices need time to spin up. - */ -#define UB_URB_TIMEOUT (HZ*2) -#define UB_DATA_TIMEOUT (HZ*5) /* ZIP does spin-ups in the data phase */ -#define UB_STAT_TIMEOUT (HZ*5) /* Same spinups and eject for a dataless cmd. */ -#define UB_CTRL_TIMEOUT (HZ/2) /* 500ms ought to be enough to clear a stall */ - -/* - * An instance of a SCSI command in transit. - */ -#define UB_DIR_NONE 0 -#define UB_DIR_READ 1 -#define UB_DIR_ILLEGAL2 2 -#define UB_DIR_WRITE 3 - -#define UB_DIR_CHAR(c) (((c)==UB_DIR_WRITE)? 'w': \ - (((c)==UB_DIR_READ)? 'r': 'n')) - -enum ub_scsi_cmd_state { - UB_CMDST_INIT, /* Initial state */ - UB_CMDST_CMD, /* Command submitted */ - UB_CMDST_DATA, /* Data phase */ - UB_CMDST_CLR2STS, /* Clearing before requesting status */ - UB_CMDST_STAT, /* Status phase */ - UB_CMDST_CLEAR, /* Clearing a stall (halt, actually) */ - UB_CMDST_CLRRS, /* Clearing before retrying status */ - UB_CMDST_SENSE, /* Sending Request Sense */ - UB_CMDST_DONE /* Final state */ -}; - -struct ub_scsi_cmd { - unsigned char cdb[UB_MAX_CDB_SIZE]; - unsigned char cdb_len; - - unsigned char dir; /* 0 - none, 1 - read, 3 - write. */ - enum ub_scsi_cmd_state state; - unsigned int tag; - struct ub_scsi_cmd *next; - - int error; /* Return code - valid upon done */ - unsigned int act_len; /* Return size */ - unsigned char key, asc, ascq; /* May be valid if error==-EIO */ - - int stat_count; /* Retries getting status. */ - unsigned int timeo; /* jiffies until rq->timeout changes */ - - unsigned int len; /* Requested length */ - unsigned int current_sg; - unsigned int nsg; /* sgv[nsg] */ - struct scatterlist sgv[UB_MAX_REQ_SG]; - - struct ub_lun *lun; - void (*done)(struct ub_dev *, struct ub_scsi_cmd *); - void *back; -}; - -struct ub_request { - struct request *rq; - unsigned int current_try; - unsigned int nsg; /* sgv[nsg] */ - struct scatterlist sgv[UB_MAX_REQ_SG]; -}; - -/* - */ -struct ub_capacity { - unsigned long nsec; /* Linux size - 512 byte sectors */ - unsigned int bsize; /* Linux hardsect_size */ - unsigned int bshift; /* Shift between 512 and hard sects */ -}; - -/* - * This is a direct take-off from linux/include/completion.h - * The difference is that I do not wait on this thing, just poll. - * When I want to wait (ub_probe), I just use the stock completion. - * - * Note that INIT_COMPLETION takes no lock. It is correct. But why - * in the bloody hell that thing takes struct instead of pointer to struct - * is quite beyond me. I just copied it from the stock completion. - */ -struct ub_completion { - unsigned int done; - spinlock_t lock; -}; - -static DEFINE_MUTEX(ub_mutex); -static inline void ub_init_completion(struct ub_completion *x) -{ - x->done = 0; - spin_lock_init(&x->lock); -} - -#define UB_INIT_COMPLETION(x) ((x).done = 0) - -static void ub_complete(struct ub_completion *x) -{ - unsigned long flags; - - spin_lock_irqsave(&x->lock, flags); - x->done++; - spin_unlock_irqrestore(&x->lock, flags); -} - -static int ub_is_completed(struct ub_completion *x) -{ - unsigned long flags; - int ret; - - spin_lock_irqsave(&x->lock, flags); - ret = x->done; - spin_unlock_irqrestore(&x->lock, flags); - return ret; -} - -/* - */ -struct ub_scsi_cmd_queue { - int qlen, qmax; - struct ub_scsi_cmd *head, *tail; -}; - -/* - * The block device instance (one per LUN). - */ -struct ub_lun { - struct ub_dev *udev; - struct list_head link; - struct gendisk *disk; - int id; /* Host index */ - int num; /* LUN number */ - char name[16]; - - int changed; /* Media was changed */ - int removable; - int readonly; - - struct ub_request urq; - - /* Use Ingo's mempool if or when we have more than one command. */ - /* - * Currently we never need more than one command for the whole device. - * However, giving every LUN a command is a cheap and automatic way - * to enforce fairness between them. - */ - int cmda[1]; - struct ub_scsi_cmd cmdv[1]; - - struct ub_capacity capacity; -}; - -/* - * The USB device instance. - */ -struct ub_dev { - spinlock_t *lock; - atomic_t poison; /* The USB device is disconnected */ - int openc; /* protected by ub_lock! */ - /* kref is too implicit for our taste */ - int reset; /* Reset is running */ - int bad_resid; - unsigned int tagcnt; - char name[12]; - struct usb_device *dev; - struct usb_interface *intf; - - struct list_head luns; - - unsigned int send_bulk_pipe; /* cached pipe values */ - unsigned int recv_bulk_pipe; - unsigned int send_ctrl_pipe; - unsigned int recv_ctrl_pipe; - - struct tasklet_struct tasklet; - - struct ub_scsi_cmd_queue cmd_queue; - struct ub_scsi_cmd top_rqs_cmd; /* REQUEST SENSE */ - unsigned char top_sense[UB_SENSE_SIZE]; - - struct ub_completion work_done; - struct urb work_urb; - struct timer_list work_timer; - int last_pipe; /* What might need clearing */ - __le32 signature; /* Learned signature */ - struct bulk_cb_wrap work_bcb; - struct bulk_cs_wrap work_bcs; - struct usb_ctrlrequest work_cr; - - struct work_struct reset_work; - wait_queue_head_t reset_wait; -}; - -/* - */ -static void ub_cleanup(struct ub_dev *sc); -static int ub_request_fn_1(struct ub_lun *lun, struct request *rq); -static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun, - struct ub_scsi_cmd *cmd, struct ub_request *urq); -static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun, - struct ub_scsi_cmd *cmd, struct ub_request *urq); -static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd); -static void ub_end_rq(struct request *rq, unsigned int status); -static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun, - struct ub_request *urq, struct ub_scsi_cmd *cmd); -static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd); -static void ub_urb_complete(struct urb *urb); -static void ub_scsi_action(unsigned long _dev); -static void ub_scsi_dispatch(struct ub_dev *sc); -static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd); -static void ub_data_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd); -static void ub_state_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int rc); -static int __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd); -static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd); -static void ub_state_stat_counted(struct ub_dev *sc, struct ub_scsi_cmd *cmd); -static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd); -static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd, - int stalled_pipe); -static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd); -static void ub_reset_enter(struct ub_dev *sc, int try); -static void ub_reset_task(struct work_struct *work); -static int ub_sync_tur(struct ub_dev *sc, struct ub_lun *lun); -static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun, - struct ub_capacity *ret); -static int ub_sync_reset(struct ub_dev *sc); -static int ub_probe_clear_stall(struct ub_dev *sc, int stalled_pipe); -static int ub_probe_lun(struct ub_dev *sc, int lnum); - -/* - */ -#ifdef CONFIG_USB_LIBUSUAL - -#define ub_usb_ids usb_storage_usb_ids -#else - -static const struct usb_device_id ub_usb_ids[] = { - { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) }, - { } -}; - -MODULE_DEVICE_TABLE(usb, ub_usb_ids); -#endif /* CONFIG_USB_LIBUSUAL */ - -/* - * Find me a way to identify "next free minor" for add_disk(), - * and the array disappears the next day. However, the number of - * hosts has something to do with the naming and /proc/partitions. - * This has to be thought out in detail before changing. - * If UB_MAX_HOST was 1000, we'd use a bitmap. Or a better data structure. - */ -#define UB_MAX_HOSTS 26 -static char ub_hostv[UB_MAX_HOSTS]; - -#define UB_QLOCK_NUM 5 -static spinlock_t ub_qlockv[UB_QLOCK_NUM]; -static int ub_qlock_next = 0; - -static DEFINE_SPINLOCK(ub_lock); /* Locks globals and ->openc */ - -/* - * The id allocator. - * - * This also stores the host for indexing by minor, which is somewhat dirty. - */ -static int ub_id_get(void) -{ - unsigned long flags; - int i; - - spin_lock_irqsave(&ub_lock, flags); - for (i = 0; i < UB_MAX_HOSTS; i++) { - if (ub_hostv[i] == 0) { - ub_hostv[i] = 1; - spin_unlock_irqrestore(&ub_lock, flags); - return i; - } - } - spin_unlock_irqrestore(&ub_lock, flags); - return -1; -} - -static void ub_id_put(int id) -{ - unsigned long flags; - - if (id < 0 || id >= UB_MAX_HOSTS) { - printk(KERN_ERR DRV_NAME ": bad host ID %d\n", id); - return; - } - - spin_lock_irqsave(&ub_lock, flags); - if (ub_hostv[id] == 0) { - spin_unlock_irqrestore(&ub_lock, flags); - printk(KERN_ERR DRV_NAME ": freeing free host ID %d\n", id); - return; - } - ub_hostv[id] = 0; - spin_unlock_irqrestore(&ub_lock, flags); -} - -/* - * This is necessitated by the fact that blk_cleanup_queue does not - * necesserily destroy the queue. Instead, it may merely decrease q->refcnt. - * Since our blk_init_queue() passes a spinlock common with ub_dev, - * we have life time issues when ub_cleanup frees ub_dev. - */ -static spinlock_t *ub_next_lock(void) -{ - unsigned long flags; - spinlock_t *ret; - - spin_lock_irqsave(&ub_lock, flags); - ret = &ub_qlockv[ub_qlock_next]; - ub_qlock_next = (ub_qlock_next + 1) % UB_QLOCK_NUM; - spin_unlock_irqrestore(&ub_lock, flags); - return ret; -} - -/* - * Downcount for deallocation. This rides on two assumptions: - * - once something is poisoned, its refcount cannot grow - * - opens cannot happen at this time (del_gendisk was done) - * If the above is true, we can drop the lock, which we need for - * blk_cleanup_queue(): the silly thing may attempt to sleep. - * [Actually, it never needs to sleep for us, but it calls might_sleep()] - */ -static void ub_put(struct ub_dev *sc) -{ - unsigned long flags; - - spin_lock_irqsave(&ub_lock, flags); - --sc->openc; - if (sc->openc == 0 && atomic_read(&sc->poison)) { - spin_unlock_irqrestore(&ub_lock, flags); - ub_cleanup(sc); - } else { - spin_unlock_irqrestore(&ub_lock, flags); - } -} - -/* - * Final cleanup and deallocation. - */ -static void ub_cleanup(struct ub_dev *sc) -{ - struct list_head *p; - struct ub_lun *lun; - struct request_queue *q; - - while (!list_empty(&sc->luns)) { - p = sc->luns.next; - lun = list_entry(p, struct ub_lun, link); - list_del(p); - - /* I don't think queue can be NULL. But... Stolen from sx8.c */ - if ((q = lun->disk->queue) != NULL) - blk_cleanup_queue(q); - /* - * If we zero disk->private_data BEFORE put_disk, we have - * to check for NULL all over the place in open, release, - * check_media and revalidate, because the block level - * semaphore is well inside the put_disk. - * But we cannot zero after the call, because *disk is gone. - * The sd.c is blatantly racy in this area. - */ - /* disk->private_data = NULL; */ - put_disk(lun->disk); - lun->disk = NULL; - - ub_id_put(lun->id); - kfree(lun); - } - - usb_set_intfdata(sc->intf, NULL); - usb_put_intf(sc->intf); - usb_put_dev(sc->dev); - kfree(sc); -} - -/* - * The "command allocator". - */ -static struct ub_scsi_cmd *ub_get_cmd(struct ub_lun *lun) -{ - struct ub_scsi_cmd *ret; - - if (lun->cmda[0]) - return NULL; - ret = &lun->cmdv[0]; - lun->cmda[0] = 1; - return ret; -} - -static void ub_put_cmd(struct ub_lun *lun, struct ub_scsi_cmd *cmd) -{ - if (cmd != &lun->cmdv[0]) { - printk(KERN_WARNING "%s: releasing a foreign cmd %p\n", - lun->name, cmd); - return; - } - if (!lun->cmda[0]) { - printk(KERN_WARNING "%s: releasing a free cmd\n", lun->name); - return; - } - lun->cmda[0] = 0; -} - -/* - * The command queue. - */ -static void ub_cmdq_add(struct ub_dev *sc, struct ub_scsi_cmd *cmd) -{ - struct ub_scsi_cmd_queue *t = &sc->cmd_queue; - - if (t->qlen++ == 0) { - t->head = cmd; - t->tail = cmd; - } else { - t->tail->next = cmd; - t->tail = cmd; - } - - if (t->qlen > t->qmax) - t->qmax = t->qlen; -} - -static void ub_cmdq_insert(struct ub_dev *sc, struct ub_scsi_cmd *cmd) -{ - struct ub_scsi_cmd_queue *t = &sc->cmd_queue; - - if (t->qlen++ == 0) { - t->head = cmd; - t->tail = cmd; - } else { - cmd->next = t->head; - t->head = cmd; - } - - if (t->qlen > t->qmax) - t->qmax = t->qlen; -} - -static struct ub_scsi_cmd *ub_cmdq_pop(struct ub_dev *sc) -{ - struct ub_scsi_cmd_queue *t = &sc->cmd_queue; - struct ub_scsi_cmd *cmd; - - if (t->qlen == 0) - return NULL; - if (--t->qlen == 0) - t->tail = NULL; - cmd = t->head; - t->head = cmd->next; - cmd->next = NULL; - return cmd; -} - -#define ub_cmdq_peek(sc) ((sc)->cmd_queue.head) - -/* - * The request function is our main entry point - */ - -static void ub_request_fn(struct request_queue *q) -{ - struct ub_lun *lun = q->queuedata; - struct request *rq; - - while ((rq = blk_peek_request(q)) != NULL) { - if (ub_request_fn_1(lun, rq) != 0) { - blk_stop_queue(q); - break; - } - } -} - -static int ub_request_fn_1(struct ub_lun *lun, struct request *rq) -{ - struct ub_dev *sc = lun->udev; - struct ub_scsi_cmd *cmd; - struct ub_request *urq; - int n_elem; - - if (atomic_read(&sc->poison)) { - blk_start_request(rq); - ub_end_rq(rq, DID_NO_CONNECT << 16); - return 0; - } - - if (lun->changed && rq->cmd_type != REQ_TYPE_BLOCK_PC) { - blk_start_request(rq); - ub_end_rq(rq, SAM_STAT_CHECK_CONDITION); - return 0; - } - - if (lun->urq.rq != NULL) - return -1; - if ((cmd = ub_get_cmd(lun)) == NULL) - return -1; - memset(cmd, 0, sizeof(struct ub_scsi_cmd)); - - blk_start_request(rq); - - urq = &lun->urq; - memset(urq, 0, sizeof(struct ub_request)); - urq->rq = rq; - - /* - * get scatterlist from block layer - */ - sg_init_table(&urq->sgv[0], UB_MAX_REQ_SG); - n_elem = blk_rq_map_sg(lun->disk->queue, rq, &urq->sgv[0]); - if (n_elem < 0) { - /* Impossible, because blk_rq_map_sg should not hit ENOMEM. */ - printk(KERN_INFO "%s: failed request map (%d)\n", - lun->name, n_elem); - goto drop; - } - if (n_elem > UB_MAX_REQ_SG) { /* Paranoia */ - printk(KERN_WARNING "%s: request with %d segments\n", - lun->name, n_elem); - goto drop; - } - urq->nsg = n_elem; - - if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { - ub_cmd_build_packet(sc, lun, cmd, urq); - } else { - ub_cmd_build_block(sc, lun, cmd, urq); - } - cmd->state = UB_CMDST_INIT; - cmd->lun = lun; - cmd->done = ub_rw_cmd_done; - cmd->back = urq; - - cmd->tag = sc->tagcnt++; - if (ub_submit_scsi(sc, cmd) != 0) - goto drop; - - return 0; - -drop: - ub_put_cmd(lun, cmd); - ub_end_rq(rq, DID_ERROR << 16); - return 0; -} - -static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun, - struct ub_scsi_cmd *cmd, struct ub_request *urq) -{ - struct request *rq = urq->rq; - unsigned int block, nblks; - - if (rq_data_dir(rq) == WRITE) - cmd->dir = UB_DIR_WRITE; - else - cmd->dir = UB_DIR_READ; - - cmd->nsg = urq->nsg; - memcpy(cmd->sgv, urq->sgv, sizeof(struct scatterlist) * cmd->nsg); - - /* - * build the command - * - * The call to blk_queue_logical_block_size() guarantees that request - * is aligned, but it is given in terms of 512 byte units, always. - */ - block = blk_rq_pos(rq) >> lun->capacity.bshift; - nblks = blk_rq_sectors(rq) >> lun->capacity.bshift; - - cmd->cdb[0] = (cmd->dir == UB_DIR_READ)? READ_10: WRITE_10; - /* 10-byte uses 4 bytes of LBA: 2147483648KB, 2097152MB, 2048GB */ - cmd->cdb[2] = block >> 24; - cmd->cdb[3] = block >> 16; - cmd->cdb[4] = block >> 8; - cmd->cdb[5] = block; - cmd->cdb[7] = nblks >> 8; - cmd->cdb[8] = nblks; - cmd->cdb_len = 10; - - cmd->len = blk_rq_bytes(rq); -} - -static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun, - struct ub_scsi_cmd *cmd, struct ub_request *urq) -{ - struct request *rq = urq->rq; - - if (blk_rq_bytes(rq) == 0) { - cmd->dir = UB_DIR_NONE; - } else { - if (rq_data_dir(rq) == WRITE) - cmd->dir = UB_DIR_WRITE; - else - cmd->dir = UB_DIR_READ; - } - - cmd->nsg = urq->nsg; - memcpy(cmd->sgv, urq->sgv, sizeof(struct scatterlist) * cmd->nsg); - - memcpy(&cmd->cdb, rq->cmd, rq->cmd_len); - cmd->cdb_len = rq->cmd_len; - - cmd->len = blk_rq_bytes(rq); - - /* - * To reapply this to every URB is not as incorrect as it looks. - * In return, we avoid any complicated tracking calculations. - */ - cmd->timeo = rq->timeout; -} - -static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd) -{ - struct ub_lun *lun = cmd->lun; - struct ub_request *urq = cmd->back; - struct request *rq; - unsigned int scsi_status; - - rq = urq->rq; - - if (cmd->error == 0) { - if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { - if (cmd->act_len >= rq->resid_len) - rq->resid_len = 0; - else - rq->resid_len -= cmd->act_len; - scsi_status = 0; - } else { - if (cmd->act_len != cmd->len) { - scsi_status = SAM_STAT_CHECK_CONDITION; - } else { - scsi_status = 0; - } - } - } else { - if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { - /* UB_SENSE_SIZE is smaller than SCSI_SENSE_BUFFERSIZE */ - memcpy(rq->sense, sc->top_sense, UB_SENSE_SIZE); - rq->sense_len = UB_SENSE_SIZE; - if (sc->top_sense[0] != 0) - scsi_status = SAM_STAT_CHECK_CONDITION; - else - scsi_status = DID_ERROR << 16; - } else { - if (cmd->error == -EIO && - (cmd->key == 0 || - cmd->key == MEDIUM_ERROR || - cmd->key == UNIT_ATTENTION)) { - if (ub_rw_cmd_retry(sc, lun, urq, cmd) == 0) - return; - } - scsi_status = SAM_STAT_CHECK_CONDITION; - } - } - - urq->rq = NULL; - - ub_put_cmd(lun, cmd); - ub_end_rq(rq, scsi_status); - blk_start_queue(lun->disk->queue); -} - -static void ub_end_rq(struct request *rq, unsigned int scsi_status) -{ - int error; - - if (scsi_status == 0) { - error = 0; - } else { - error = -EIO; - rq->errors = scsi_status; - } - __blk_end_request_all(rq, error); -} - -static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun, - struct ub_request *urq, struct ub_scsi_cmd *cmd) -{ - - if (atomic_read(&sc->poison)) - return -ENXIO; - - ub_reset_enter(sc, urq->current_try); - - if (urq->current_try >= 3) - return -EIO; - urq->current_try++; - - /* Remove this if anyone complains of flooding. */ - printk(KERN_DEBUG "%s: dir %c len/act %d/%d " - "[sense %x %02x %02x] retry %d\n", - sc->name, UB_DIR_CHAR(cmd->dir), cmd->len, cmd->act_len, - cmd->key, cmd->asc, cmd->ascq, urq->current_try); - - memset(cmd, 0, sizeof(struct ub_scsi_cmd)); - ub_cmd_build_block(sc, lun, cmd, urq); - - cmd->state = UB_CMDST_INIT; - cmd->lun = lun; - cmd->done = ub_rw_cmd_done; - cmd->back = urq; - - cmd->tag = sc->tagcnt++; - -#if 0 /* Wasteful */ - return ub_submit_scsi(sc, cmd); -#else - ub_cmdq_add(sc, cmd); - return 0; -#endif -} - -/* - * Submit a regular SCSI operation (not an auto-sense). - * - * The Iron Law of Good Submit Routine is: - * Zero return - callback is done, Nonzero return - callback is not done. - * No exceptions. - * - * Host is assumed locked. - */ -static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd) -{ - - if (cmd->state != UB_CMDST_INIT || - (cmd->dir != UB_DIR_NONE && cmd->len == 0)) { - return -EINVAL; - } - - ub_cmdq_add(sc, cmd); - /* - * We can call ub_scsi_dispatch(sc) right away here, but it's a little - * safer to jump to a tasklet, in case upper layers do something silly. - */ - tasklet_schedule(&sc->tasklet); - return 0; -} - -/* - * Submit the first URB for the queued command. - * This function does not deal with queueing in any way. - */ -static int ub_scsi_cmd_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd) -{ - struct bulk_cb_wrap *bcb; - int rc; - - bcb = &sc->work_bcb; - - /* - * ``If the allocation length is eighteen or greater, and a device - * server returns less than eithteen bytes of data, the application - * client should assume that the bytes not transferred would have been - * zeroes had the device server returned those bytes.'' - * - * We zero sense for all commands so that when a packet request - * fails it does not return a stale sense. - */ - memset(&sc->top_sense, 0, UB_SENSE_SIZE); - - /* set up the command wrapper */ - bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN); - bcb->Tag = cmd->tag; /* Endianness is not important */ - bcb->DataTransferLength = cpu_to_le32(cmd->len); - bcb->Flags = (cmd->dir == UB_DIR_READ) ? 0x80 : 0; - bcb->Lun = (cmd->lun != NULL) ? cmd->lun->num : 0; - bcb->Length = cmd->cdb_len; - - /* copy the command payload */ - memcpy(bcb->CDB, cmd->cdb, UB_MAX_CDB_SIZE); - - UB_INIT_COMPLETION(sc->work_done); - - sc->last_pipe = sc->send_bulk_pipe; - usb_fill_bulk_urb(&sc->work_urb, sc->dev, sc->send_bulk_pipe, - bcb, US_BULK_CB_WRAP_LEN, ub_urb_complete, sc); - - if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { - /* XXX Clear stalls */ - ub_complete(&sc->work_done); - return rc; - } - - sc->work_timer.expires = jiffies + UB_URB_TIMEOUT; - add_timer(&sc->work_timer); - - cmd->state = UB_CMDST_CMD; - return 0; -} - -/* - * Timeout handler. - */ -static void ub_urb_timeout(unsigned long arg) -{ - struct ub_dev *sc = (struct ub_dev *) arg; - unsigned long flags; - - spin_lock_irqsave(sc->lock, flags); - if (!ub_is_completed(&sc->work_done)) - usb_unlink_urb(&sc->work_urb); - spin_unlock_irqrestore(sc->lock, flags); -} - -/* - * Completion routine for the work URB. - * - * This can be called directly from usb_submit_urb (while we have - * the sc->lock taken) and from an interrupt (while we do NOT have - * the sc->lock taken). Therefore, bounce this off to a tasklet. - */ -static void ub_urb_complete(struct urb *urb) -{ - struct ub_dev *sc = urb->context; - - ub_complete(&sc->work_done); - tasklet_schedule(&sc->tasklet); -} - -static void ub_scsi_action(unsigned long _dev) -{ - struct ub_dev *sc = (struct ub_dev *) _dev; - unsigned long flags; - - spin_lock_irqsave(sc->lock, flags); - ub_scsi_dispatch(sc); - spin_unlock_irqrestore(sc->lock, flags); -} - -static void ub_scsi_dispatch(struct ub_dev *sc) -{ - struct ub_scsi_cmd *cmd; - int rc; - - while (!sc->reset && (cmd = ub_cmdq_peek(sc)) != NULL) { - if (cmd->state == UB_CMDST_DONE) { - ub_cmdq_pop(sc); - (*cmd->done)(sc, cmd); - } else if (cmd->state == UB_CMDST_INIT) { - if ((rc = ub_scsi_cmd_start(sc, cmd)) == 0) - break; - cmd->error = rc; - cmd->state = UB_CMDST_DONE; - } else { - if (!ub_is_completed(&sc->work_done)) - break; - del_timer(&sc->work_timer); - ub_scsi_urb_compl(sc, cmd); - } - } -} - -static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd) -{ - struct urb *urb = &sc->work_urb; - struct bulk_cs_wrap *bcs; - int endp; - int len; - int rc; - - if (atomic_read(&sc->poison)) { - ub_state_done(sc, cmd, -ENODEV); - return; - } - - endp = usb_pipeendpoint(sc->last_pipe); - if (usb_pipein(sc->last_pipe)) - endp |= USB_DIR_IN; - - if (cmd->state == UB_CMDST_CLEAR) { - if (urb->status == -EPIPE) { - /* - * STALL while clearning STALL. - * The control pipe clears itself - nothing to do. - */ - printk(KERN_NOTICE "%s: stall on control pipe\n", - sc->name); - goto Bad_End; - } - - /* - * We ignore the result for the halt clear. - */ - - usb_reset_endpoint(sc->dev, endp); - - ub_state_sense(sc, cmd); - - } else if (cmd->state == UB_CMDST_CLR2STS) { - if (urb->status == -EPIPE) { - printk(KERN_NOTICE "%s: stall on control pipe\n", - sc->name); - goto Bad_End; - } - - /* - * We ignore the result for the halt clear. - */ - - usb_reset_endpoint(sc->dev, endp); - - ub_state_stat(sc, cmd); - - } else if (cmd->state == UB_CMDST_CLRRS) { - if (urb->status == -EPIPE) { - printk(KERN_NOTICE "%s: stall on control pipe\n", - sc->name); - goto Bad_End; - } - - /* - * We ignore the result for the halt clear. - */ - - usb_reset_endpoint(sc->dev, endp); - - ub_state_stat_counted(sc, cmd); - - } else if (cmd->state == UB_CMDST_CMD) { - switch (urb->status) { - case 0: - break; - case -EOVERFLOW: - goto Bad_End; - case -EPIPE: - rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); - if (rc != 0) { - printk(KERN_NOTICE "%s: " - "unable to submit clear (%d)\n", - sc->name, rc); - /* - * This is typically ENOMEM or some other such shit. - * Retrying is pointless. Just do Bad End on it... - */ - ub_state_done(sc, cmd, rc); - return; - } - cmd->state = UB_CMDST_CLEAR; - return; - case -ESHUTDOWN: /* unplug */ - case -EILSEQ: /* unplug timeout on uhci */ - ub_state_done(sc, cmd, -ENODEV); - return; - default: - goto Bad_End; - } - if (urb->actual_length != US_BULK_CB_WRAP_LEN) { - goto Bad_End; - } - - if (cmd->dir == UB_DIR_NONE || cmd->nsg < 1) { - ub_state_stat(sc, cmd); - return; - } - - // udelay(125); // usb-storage has this - ub_data_start(sc, cmd); - - } else if (cmd->state == UB_CMDST_DATA) { - if (urb->status == -EPIPE) { - rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); - if (rc != 0) { - printk(KERN_NOTICE "%s: " - "unable to submit clear (%d)\n", - sc->name, rc); - ub_state_done(sc, cmd, rc); - return; - } - cmd->state = UB_CMDST_CLR2STS; - return; - } - if (urb->status == -EOVERFLOW) { - /* - * A babble? Failure, but we must transfer CSW now. - */ - cmd->error = -EOVERFLOW; /* A cheap trick... */ - ub_state_stat(sc, cmd); - return; - } - - if (cmd->dir == UB_DIR_WRITE) { - /* - * Do not continue writes in case of a failure. - * Doing so would cause sectors to be mixed up, - * which is worse than sectors lost. - * - * We must try to read the CSW, or many devices - * get confused. - */ - len = urb->actual_length; - if (urb->status != 0 || - len != cmd->sgv[cmd->current_sg].length) { - cmd->act_len += len; - - cmd->error = -EIO; - ub_state_stat(sc, cmd); - return; - } - - } else { - /* - * If an error occurs on read, we record it, and - * continue to fetch data in order to avoid bubble. - * - * As a small shortcut, we stop if we detect that - * a CSW mixed into data. - */ - if (urb->status != 0) - cmd->error = -EIO; - - len = urb->actual_length; - if (urb->status != 0 || - len != cmd->sgv[cmd->current_sg].length) { - if ((len & 0x1FF) == US_BULK_CS_WRAP_LEN) - goto Bad_End; - } - } - - cmd->act_len += urb->actual_length; - - if (++cmd->current_sg < cmd->nsg) { - ub_data_start(sc, cmd); - return; - } - ub_state_stat(sc, cmd); - - } else if (cmd->state == UB_CMDST_STAT) { - if (urb->status == -EPIPE) { - rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); - if (rc != 0) { - printk(KERN_NOTICE "%s: " - "unable to submit clear (%d)\n", - sc->name, rc); - ub_state_done(sc, cmd, rc); - return; - } - - /* - * Having a stall when getting CSW is an error, so - * make sure uppper levels are not oblivious to it. - */ - cmd->error = -EIO; /* A cheap trick... */ - - cmd->state = UB_CMDST_CLRRS; - return; - } - - /* Catch everything, including -EOVERFLOW and other nasties. */ - if (urb->status != 0) - goto Bad_End; - - if (urb->actual_length == 0) { - ub_state_stat_counted(sc, cmd); - return; - } - - /* - * Check the returned Bulk protocol status. - * The status block has to be validated first. - */ - - bcs = &sc->work_bcs; - - if (sc->signature == cpu_to_le32(0)) { - /* - * This is the first reply, so do not perform the check. - * Instead, remember the signature the device uses - * for future checks. But do not allow a nul. - */ - sc->signature = bcs->Signature; - if (sc->signature == cpu_to_le32(0)) { - ub_state_stat_counted(sc, cmd); - return; - } - } else { - if (bcs->Signature != sc->signature) { - ub_state_stat_counted(sc, cmd); - return; - } - } - - if (bcs->Tag != cmd->tag) { - /* - * This usually happens when we disagree with the - * device's microcode about something. For instance, - * a few of them throw this after timeouts. They buffer - * commands and reply at commands we timed out before. - * Without flushing these replies we loop forever. - */ - ub_state_stat_counted(sc, cmd); - return; - } - - if (!sc->bad_resid) { - len = le32_to_cpu(bcs->Residue); - if (len != cmd->len - cmd->act_len) { - /* - * Only start ignoring if this cmd ended well. - */ - if (cmd->len == cmd->act_len) { - printk(KERN_NOTICE "%s: " - "bad residual %d of %d, ignoring\n", - sc->name, len, cmd->len); - sc->bad_resid = 1; - } - } - } - - switch (bcs->Status) { - case US_BULK_STAT_OK: - break; - case US_BULK_STAT_FAIL: - ub_state_sense(sc, cmd); - return; - case US_BULK_STAT_PHASE: - goto Bad_End; - default: - printk(KERN_INFO "%s: unknown CSW status 0x%x\n", - sc->name, bcs->Status); - ub_state_done(sc, cmd, -EINVAL); - return; - } - - /* Not zeroing error to preserve a babble indicator */ - if (cmd->error != 0) { - ub_state_sense(sc, cmd); - return; - } - cmd->state = UB_CMDST_DONE; - ub_cmdq_pop(sc); - (*cmd->done)(sc, cmd); - - } else if (cmd->state == UB_CMDST_SENSE) { - ub_state_done(sc, cmd, -EIO); - - } else { - printk(KERN_WARNING "%s: wrong command state %d\n", - sc->name, cmd->state); - ub_state_done(sc, cmd, -EINVAL); - return; - } - return; - -Bad_End: /* Little Excel is dead */ - ub_state_done(sc, cmd, -EIO); -} - -/* - * Factorization helper for the command state machine: - * Initiate a data segment transfer. - */ -static void ub_data_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd) -{ - struct scatterlist *sg = &cmd->sgv[cmd->current_sg]; - int pipe; - int rc; - - UB_INIT_COMPLETION(sc->work_done); - - if (cmd->dir == UB_DIR_READ) - pipe = sc->recv_bulk_pipe; - else - pipe = sc->send_bulk_pipe; - sc->last_pipe = pipe; - usb_fill_bulk_urb(&sc->work_urb, sc->dev, pipe, sg_virt(sg), - sg->length, ub_urb_complete, sc); - - if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { - /* XXX Clear stalls */ - ub_complete(&sc->work_done); - ub_state_done(sc, cmd, rc); - return; - } - - if (cmd->timeo) - sc->work_timer.expires = jiffies + cmd->timeo; - else - sc->work_timer.expires = jiffies + UB_DATA_TIMEOUT; - add_timer(&sc->work_timer); - - cmd->state = UB_CMDST_DATA; -} - -/* - * Factorization helper for the command state machine: - * Finish the command. - */ -static void ub_state_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int rc) -{ - - cmd->error = rc; - cmd->state = UB_CMDST_DONE; - ub_cmdq_pop(sc); - (*cmd->done)(sc, cmd); -} - -/* - * Factorization helper for the command state machine: - * Submit a CSW read. - */ -static int __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd) -{ - int rc; - - UB_INIT_COMPLETION(sc->work_done); - - sc->last_pipe = sc->recv_bulk_pipe; - usb_fill_bulk_urb(&sc->work_urb, sc->dev, sc->recv_bulk_pipe, - &sc->work_bcs, US_BULK_CS_WRAP_LEN, ub_urb_complete, sc); - - if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { - /* XXX Clear stalls */ - ub_complete(&sc->work_done); - ub_state_done(sc, cmd, rc); - return -1; - } - - if (cmd->timeo) - sc->work_timer.expires = jiffies + cmd->timeo; - else - sc->work_timer.expires = jiffies + UB_STAT_TIMEOUT; - add_timer(&sc->work_timer); - return 0; -} - -/* - * Factorization helper for the command state machine: - * Submit a CSW read and go to STAT state. - */ -static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd) -{ - - if (__ub_state_stat(sc, cmd) != 0) - return; - - cmd->stat_count = 0; - cmd->state = UB_CMDST_STAT; -} - -/* - * Factorization helper for the command state machine: - * Submit a CSW read and go to STAT state with counter (along [C] path). - */ -static void ub_state_stat_counted(struct ub_dev *sc, struct ub_scsi_cmd *cmd) -{ - - if (++cmd->stat_count >= 4) { - ub_state_sense(sc, cmd); - return; - } - - if (__ub_state_stat(sc, cmd) != 0) - return; - - cmd->state = UB_CMDST_STAT; -} - -/* - * Factorization helper for the command state machine: - * Submit a REQUEST SENSE and go to SENSE state. - */ -static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd) -{ - struct ub_scsi_cmd *scmd; - struct scatterlist *sg; - int rc; - - if (cmd->cdb[0] == REQUEST_SENSE) { - rc = -EPIPE; - goto error; - } - - scmd = &sc->top_rqs_cmd; - memset(scmd, 0, sizeof(struct ub_scsi_cmd)); - scmd->cdb[0] = REQUEST_SENSE; - scmd->cdb[4] = UB_SENSE_SIZE; - scmd->cdb_len = 6; - scmd->dir = UB_DIR_READ; - scmd->state = UB_CMDST_INIT; - scmd->nsg = 1; - sg = &scmd->sgv[0]; - sg_init_table(sg, UB_MAX_REQ_SG); - sg_set_page(sg, virt_to_page(sc->top_sense), UB_SENSE_SIZE, - (unsigned long)sc->top_sense & (PAGE_SIZE-1)); - scmd->len = UB_SENSE_SIZE; - scmd->lun = cmd->lun; - scmd->done = ub_top_sense_done; - scmd->back = cmd; - - scmd->tag = sc->tagcnt++; - - cmd->state = UB_CMDST_SENSE; - - ub_cmdq_insert(sc, scmd); - return; - -error: - ub_state_done(sc, cmd, rc); -} - -/* - * A helper for the command's state machine: - * Submit a stall clear. - */ -static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd, - int stalled_pipe) -{ - int endp; - struct usb_ctrlrequest *cr; - int rc; - - endp = usb_pipeendpoint(stalled_pipe); - if (usb_pipein (stalled_pipe)) - endp |= USB_DIR_IN; - - cr = &sc->work_cr; - cr->bRequestType = USB_RECIP_ENDPOINT; - cr->bRequest = USB_REQ_CLEAR_FEATURE; - cr->wValue = cpu_to_le16(USB_ENDPOINT_HALT); - cr->wIndex = cpu_to_le16(endp); - cr->wLength = cpu_to_le16(0); - - UB_INIT_COMPLETION(sc->work_done); - - usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe, - (unsigned char*) cr, NULL, 0, ub_urb_complete, sc); - - if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { - ub_complete(&sc->work_done); - return rc; - } - - sc->work_timer.expires = jiffies + UB_CTRL_TIMEOUT; - add_timer(&sc->work_timer); - return 0; -} - -/* - */ -static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd) -{ - unsigned char *sense = sc->top_sense; - struct ub_scsi_cmd *cmd; - - /* - * Find the command which triggered the unit attention or a check, - * save the sense into it, and advance its state machine. - */ - if ((cmd = ub_cmdq_peek(sc)) == NULL) { - printk(KERN_WARNING "%s: sense done while idle\n", sc->name); - return; - } - if (cmd != scmd->back) { - printk(KERN_WARNING "%s: " - "sense done for wrong command 0x%x\n", - sc->name, cmd->tag); - return; - } - if (cmd->state != UB_CMDST_SENSE) { - printk(KERN_WARNING "%s: sense done with bad cmd state %d\n", - sc->name, cmd->state); - return; - } - - /* - * Ignoring scmd->act_len, because the buffer was pre-zeroed. - */ - cmd->key = sense[2] & 0x0F; - cmd->asc = sense[12]; - cmd->ascq = sense[13]; - - ub_scsi_urb_compl(sc, cmd); -} - -/* - * Reset management - */ - -static void ub_reset_enter(struct ub_dev *sc, int try) -{ - - if (sc->reset) { - /* This happens often on multi-LUN devices. */ - return; - } - sc->reset = try + 1; - -#if 0 /* Not needed because the disconnect waits for us. */ - unsigned long flags; - spin_lock_irqsave(&ub_lock, flags); - sc->openc++; - spin_unlock_irqrestore(&ub_lock, flags); -#endif - -#if 0 /* We let them stop themselves. */ - struct ub_lun *lun; - list_for_each_entry(lun, &sc->luns, link) { - blk_stop_queue(lun->disk->queue); - } -#endif - - schedule_work(&sc->reset_work); -} - -static void ub_reset_task(struct work_struct *work) -{ - struct ub_dev *sc = container_of(work, struct ub_dev, reset_work); - unsigned long flags; - struct ub_lun *lun; - int rc; - - if (!sc->reset) { - printk(KERN_WARNING "%s: Running reset unrequested\n", - sc->name); - return; - } - - if (atomic_read(&sc->poison)) { - ; - } else if ((sc->reset & 1) == 0) { - ub_sync_reset(sc); - msleep(700); /* usb-storage sleeps 6s (!) */ - ub_probe_clear_stall(sc, sc->recv_bulk_pipe); - ub_probe_clear_stall(sc, sc->send_bulk_pipe); - } else if (sc->dev->actconfig->desc.bNumInterfaces != 1) { - ; - } else { - rc = usb_lock_device_for_reset(sc->dev, sc->intf); - if (rc < 0) { - printk(KERN_NOTICE - "%s: usb_lock_device_for_reset failed (%d)\n", - sc->name, rc); - } else { - rc = usb_reset_device(sc->dev); - if (rc < 0) { - printk(KERN_NOTICE "%s: " - "usb_lock_device_for_reset failed (%d)\n", - sc->name, rc); - } - usb_unlock_device(sc->dev); - } - } - - /* - * In theory, no commands can be running while reset is active, - * so nobody can ask for another reset, and so we do not need any - * queues of resets or anything. We do need a spinlock though, - * to interact with block layer. - */ - spin_lock_irqsave(sc->lock, flags); - sc->reset = 0; - tasklet_schedule(&sc->tasklet); - list_for_each_entry(lun, &sc->luns, link) { - blk_start_queue(lun->disk->queue); - } - wake_up(&sc->reset_wait); - spin_unlock_irqrestore(sc->lock, flags); -} - -/* - * XXX Reset brackets are too much hassle to implement, so just stub them - * in order to prevent forced unbinding (which deadlocks solid when our - * ->disconnect method waits for the reset to complete and this kills keventd). - * - * XXX Tell Alan to move usb_unlock_device inside of usb_reset_device, - * or else the post_reset is invoked, and restats I/O on a locked device. - */ -static int ub_pre_reset(struct usb_interface *iface) { - return 0; -} - -static int ub_post_reset(struct usb_interface *iface) { - return 0; -} - -/* - * This is called from a process context. - */ -static void ub_revalidate(struct ub_dev *sc, struct ub_lun *lun) -{ - - lun->readonly = 0; /* XXX Query this from the device */ - - lun->capacity.nsec = 0; - lun->capacity.bsize = 512; - lun->capacity.bshift = 0; - - if (ub_sync_tur(sc, lun) != 0) - return; /* Not ready */ - lun->changed = 0; - - if (ub_sync_read_cap(sc, lun, &lun->capacity) != 0) { - /* - * The retry here means something is wrong, either with the - * device, with the transport, or with our code. - * We keep this because sd.c has retries for capacity. - */ - if (ub_sync_read_cap(sc, lun, &lun->capacity) != 0) { - lun->capacity.nsec = 0; - lun->capacity.bsize = 512; - lun->capacity.bshift = 0; - } - } -} - -/* - * The open funcion. - * This is mostly needed to keep refcounting, but also to support - * media checks on removable media drives. - */ -static int ub_bd_open(struct block_device *bdev, fmode_t mode) -{ - struct ub_lun *lun = bdev->bd_disk->private_data; - struct ub_dev *sc = lun->udev; - unsigned long flags; - int rc; - - spin_lock_irqsave(&ub_lock, flags); - if (atomic_read(&sc->poison)) { - spin_unlock_irqrestore(&ub_lock, flags); - return -ENXIO; - } - sc->openc++; - spin_unlock_irqrestore(&ub_lock, flags); - - if (lun->removable || lun->readonly) - check_disk_change(bdev); - - /* - * The sd.c considers ->media_present and ->changed not equivalent, - * under some pretty murky conditions (a failure of READ CAPACITY). - * We may need it one day. - */ - if (lun->removable && lun->changed && !(mode & FMODE_NDELAY)) { - rc = -ENOMEDIUM; - goto err_open; - } - - if (lun->readonly && (mode & FMODE_WRITE)) { - rc = -EROFS; - goto err_open; - } - - return 0; - -err_open: - ub_put(sc); - return rc; -} - -static int ub_bd_unlocked_open(struct block_device *bdev, fmode_t mode) -{ - int ret; - - mutex_lock(&ub_mutex); - ret = ub_bd_open(bdev, mode); - mutex_unlock(&ub_mutex); - - return ret; -} - - -/* - */ -static int ub_bd_release(struct gendisk *disk, fmode_t mode) -{ - struct ub_lun *lun = disk->private_data; - struct ub_dev *sc = lun->udev; - - mutex_lock(&ub_mutex); - ub_put(sc); - mutex_unlock(&ub_mutex); - - return 0; -} - -/* - * The ioctl interface. - */ -static int ub_bd_ioctl(struct block_device *bdev, fmode_t mode, - unsigned int cmd, unsigned long arg) -{ - void __user *usermem = (void __user *) arg; - int ret; - - mutex_lock(&ub_mutex); - ret = scsi_cmd_blk_ioctl(bdev, mode, cmd, usermem); - mutex_unlock(&ub_mutex); - - return ret; -} - -/* - * This is called by check_disk_change if we reported a media change. - * The main onjective here is to discover the features of the media such as - * the capacity, read-only status, etc. USB storage generally does not - * need to be spun up, but if we needed it, this would be the place. - * - * This call can sleep. - * - * The return code is not used. - */ -static int ub_bd_revalidate(struct gendisk *disk) -{ - struct ub_lun *lun = disk->private_data; - - ub_revalidate(lun->udev, lun); - - /* XXX Support sector size switching like in sr.c */ - blk_queue_logical_block_size(disk->queue, lun->capacity.bsize); - set_capacity(disk, lun->capacity.nsec); - // set_disk_ro(sdkp->disk, lun->readonly); - - return 0; -} - -/* - * The check is called by the block layer to verify if the media - * is still available. It is supposed to be harmless, lightweight and - * non-intrusive in case the media was not changed. - * - * This call can sleep. - * - * The return code is bool! - */ -static unsigned int ub_bd_check_events(struct gendisk *disk, - unsigned int clearing) -{ - struct ub_lun *lun = disk->private_data; - - if (!lun->removable) - return 0; - - /* - * We clean checks always after every command, so this is not - * as dangerous as it looks. If the TEST_UNIT_READY fails here, - * the device is actually not ready with operator or software - * intervention required. One dangerous item might be a drive which - * spins itself down, and come the time to write dirty pages, this - * will fail, then block layer discards the data. Since we never - * spin drives up, such devices simply cannot be used with ub anyway. - */ - if (ub_sync_tur(lun->udev, lun) != 0) { - lun->changed = 1; - return DISK_EVENT_MEDIA_CHANGE; - } - - return lun->changed ? DISK_EVENT_MEDIA_CHANGE : 0; -} - -static const struct block_device_operations ub_bd_fops = { - .owner = THIS_MODULE, - .open = ub_bd_unlocked_open, - .release = ub_bd_release, - .ioctl = ub_bd_ioctl, - .check_events = ub_bd_check_events, - .revalidate_disk = ub_bd_revalidate, -}; - -/* - * Common ->done routine for commands executed synchronously. - */ -static void ub_probe_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd) -{ - struct completion *cop = cmd->back; - complete(cop); -} - -/* - * Test if the device has a check condition on it, synchronously. - */ -static int ub_sync_tur(struct ub_dev *sc, struct ub_lun *lun) -{ - struct ub_scsi_cmd *cmd; - enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) }; - unsigned long flags; - struct completion compl; - int rc; - - init_completion(&compl); - - rc = -ENOMEM; - if ((cmd = kzalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) - goto err_alloc; - - cmd->cdb[0] = TEST_UNIT_READY; - cmd->cdb_len = 6; - cmd->dir = UB_DIR_NONE; - cmd->state = UB_CMDST_INIT; - cmd->lun = lun; /* This may be NULL, but that's ok */ - cmd->done = ub_probe_done; - cmd->back = &compl; - - spin_lock_irqsave(sc->lock, flags); - cmd->tag = sc->tagcnt++; - - rc = ub_submit_scsi(sc, cmd); - spin_unlock_irqrestore(sc->lock, flags); - - if (rc != 0) - goto err_submit; - - wait_for_completion(&compl); - - rc = cmd->error; - - if (rc == -EIO && cmd->key != 0) /* Retries for benh's key */ - rc = cmd->key; - -err_submit: - kfree(cmd); -err_alloc: - return rc; -} - -/* - * Read the SCSI capacity synchronously (for probing). - */ -static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun, - struct ub_capacity *ret) -{ - struct ub_scsi_cmd *cmd; - struct scatterlist *sg; - char *p; - enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) + 8 }; - unsigned long flags; - unsigned int bsize, shift; - unsigned long nsec; - struct completion compl; - int rc; - - init_completion(&compl); - - rc = -ENOMEM; - if ((cmd = kzalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) - goto err_alloc; - p = (char *)cmd + sizeof(struct ub_scsi_cmd); - - cmd->cdb[0] = 0x25; - cmd->cdb_len = 10; - cmd->dir = UB_DIR_READ; - cmd->state = UB_CMDST_INIT; - cmd->nsg = 1; - sg = &cmd->sgv[0]; - sg_init_table(sg, UB_MAX_REQ_SG); - sg_set_page(sg, virt_to_page(p), 8, (unsigned long)p & (PAGE_SIZE-1)); - cmd->len = 8; - cmd->lun = lun; - cmd->done = ub_probe_done; - cmd->back = &compl; - - spin_lock_irqsave(sc->lock, flags); - cmd->tag = sc->tagcnt++; - - rc = ub_submit_scsi(sc, cmd); - spin_unlock_irqrestore(sc->lock, flags); - - if (rc != 0) - goto err_submit; - - wait_for_completion(&compl); - - if (cmd->error != 0) { - rc = -EIO; - goto err_read; - } - if (cmd->act_len != 8) { - rc = -EIO; - goto err_read; - } - - /* sd.c special-cases sector size of 0 to mean 512. Needed? Safe? */ - nsec = be32_to_cpu(*(__be32 *)p) + 1; - bsize = be32_to_cpu(*(__be32 *)(p + 4)); - switch (bsize) { - case 512: shift = 0; break; - case 1024: shift = 1; break; - case 2048: shift = 2; break; - case 4096: shift = 3; break; - default: - rc = -EDOM; - goto err_inv_bsize; - } - - ret->bsize = bsize; - ret->bshift = shift; - ret->nsec = nsec << shift; - rc = 0; - -err_inv_bsize: -err_read: -err_submit: - kfree(cmd); -err_alloc: - return rc; -} - -/* - */ -static void ub_probe_urb_complete(struct urb *urb) -{ - struct completion *cop = urb->context; - complete(cop); -} - -static void ub_probe_timeout(unsigned long arg) -{ - struct completion *cop = (struct completion *) arg; - complete(cop); -} - -/* - * Reset with a Bulk reset. - */ -static int ub_sync_reset(struct ub_dev *sc) -{ - int ifnum = sc->intf->cur_altsetting->desc.bInterfaceNumber; - struct usb_ctrlrequest *cr; - struct completion compl; - struct timer_list timer; - int rc; - - init_completion(&compl); - - cr = &sc->work_cr; - cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE; - cr->bRequest = US_BULK_RESET_REQUEST; - cr->wValue = cpu_to_le16(0); - cr->wIndex = cpu_to_le16(ifnum); - cr->wLength = cpu_to_le16(0); - - usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe, - (unsigned char*) cr, NULL, 0, ub_probe_urb_complete, &compl); - - if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) { - printk(KERN_WARNING - "%s: Unable to submit a bulk reset (%d)\n", sc->name, rc); - return rc; - } - - init_timer(&timer); - timer.function = ub_probe_timeout; - timer.data = (unsigned long) &compl; - timer.expires = jiffies + UB_CTRL_TIMEOUT; - add_timer(&timer); - - wait_for_completion(&compl); - - del_timer_sync(&timer); - usb_kill_urb(&sc->work_urb); - - return sc->work_urb.status; -} - -/* - * Get number of LUNs by the way of Bulk GetMaxLUN command. - */ -static int ub_sync_getmaxlun(struct ub_dev *sc) -{ - int ifnum = sc->intf->cur_altsetting->desc.bInterfaceNumber; - unsigned char *p; - enum { ALLOC_SIZE = 1 }; - struct usb_ctrlrequest *cr; - struct completion compl; - struct timer_list timer; - int nluns; - int rc; - - init_completion(&compl); - - rc = -ENOMEM; - if ((p = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) - goto err_alloc; - *p = 55; - - cr = &sc->work_cr; - cr->bRequestType = USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE; - cr->bRequest = US_BULK_GET_MAX_LUN; - cr->wValue = cpu_to_le16(0); - cr->wIndex = cpu_to_le16(ifnum); - cr->wLength = cpu_to_le16(1); - - usb_fill_control_urb(&sc->work_urb, sc->dev, sc->recv_ctrl_pipe, - (unsigned char*) cr, p, 1, ub_probe_urb_complete, &compl); - - if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) - goto err_submit; - - init_timer(&timer); - timer.function = ub_probe_timeout; - timer.data = (unsigned long) &compl; - timer.expires = jiffies + UB_CTRL_TIMEOUT; - add_timer(&timer); - - wait_for_completion(&compl); - - del_timer_sync(&timer); - usb_kill_urb(&sc->work_urb); - - if ((rc = sc->work_urb.status) < 0) - goto err_io; - - if (sc->work_urb.actual_length != 1) { - nluns = 0; - } else { - if ((nluns = *p) == 55) { - nluns = 0; - } else { - /* GetMaxLUN returns the maximum LUN number */ - nluns += 1; - if (nluns > UB_MAX_LUNS) - nluns = UB_MAX_LUNS; - } - } - - kfree(p); - return nluns; - -err_io: -err_submit: - kfree(p); -err_alloc: - return rc; -} - -/* - * Clear initial stalls. - */ -static int ub_probe_clear_stall(struct ub_dev *sc, int stalled_pipe) -{ - int endp; - struct usb_ctrlrequest *cr; - struct completion compl; - struct timer_list timer; - int rc; - - init_completion(&compl); - - endp = usb_pipeendpoint(stalled_pipe); - if (usb_pipein (stalled_pipe)) - endp |= USB_DIR_IN; - - cr = &sc->work_cr; - cr->bRequestType = USB_RECIP_ENDPOINT; - cr->bRequest = USB_REQ_CLEAR_FEATURE; - cr->wValue = cpu_to_le16(USB_ENDPOINT_HALT); - cr->wIndex = cpu_to_le16(endp); - cr->wLength = cpu_to_le16(0); - - usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe, - (unsigned char*) cr, NULL, 0, ub_probe_urb_complete, &compl); - - if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) { - printk(KERN_WARNING - "%s: Unable to submit a probe clear (%d)\n", sc->name, rc); - return rc; - } - - init_timer(&timer); - timer.function = ub_probe_timeout; - timer.data = (unsigned long) &compl; - timer.expires = jiffies + UB_CTRL_TIMEOUT; - add_timer(&timer); - - wait_for_completion(&compl); - - del_timer_sync(&timer); - usb_kill_urb(&sc->work_urb); - - usb_reset_endpoint(sc->dev, endp); - - return 0; -} - -/* - * Get the pipe settings. - */ -static int ub_get_pipes(struct ub_dev *sc, struct usb_device *dev, - struct usb_interface *intf) -{ - struct usb_host_interface *altsetting = intf->cur_altsetting; - struct usb_endpoint_descriptor *ep_in = NULL; - struct usb_endpoint_descriptor *ep_out = NULL; - struct usb_endpoint_descriptor *ep; - int i; - - /* - * Find the endpoints we need. - * We are expecting a minimum of 2 endpoints - in and out (bulk). - * We will ignore any others. - */ - for (i = 0; i < altsetting->desc.bNumEndpoints; i++) { - ep = &altsetting->endpoint[i].desc; - - /* Is it a BULK endpoint? */ - if (usb_endpoint_xfer_bulk(ep)) { - /* BULK in or out? */ - if (usb_endpoint_dir_in(ep)) { - if (ep_in == NULL) - ep_in = ep; - } else { - if (ep_out == NULL) - ep_out = ep; - } - } - } - - if (ep_in == NULL || ep_out == NULL) { - printk(KERN_NOTICE "%s: failed endpoint check\n", sc->name); - return -ENODEV; - } - - /* Calculate and store the pipe values */ - sc->send_ctrl_pipe = usb_sndctrlpipe(dev, 0); - sc->recv_ctrl_pipe = usb_rcvctrlpipe(dev, 0); - sc->send_bulk_pipe = usb_sndbulkpipe(dev, - usb_endpoint_num(ep_out)); - sc->recv_bulk_pipe = usb_rcvbulkpipe(dev, - usb_endpoint_num(ep_in)); - - return 0; -} - -/* - * Probing is done in the process context, which allows us to cheat - * and not to build a state machine for the discovery. - */ -static int ub_probe(struct usb_interface *intf, - const struct usb_device_id *dev_id) -{ - struct ub_dev *sc; - int nluns; - int rc; - int i; - - if (usb_usual_check_type(dev_id, USB_US_TYPE_UB)) - return -ENXIO; - - rc = -ENOMEM; - if ((sc = kzalloc(sizeof(struct ub_dev), GFP_KERNEL)) == NULL) - goto err_core; - sc->lock = ub_next_lock(); - INIT_LIST_HEAD(&sc->luns); - usb_init_urb(&sc->work_urb); - tasklet_init(&sc->tasklet, ub_scsi_action, (unsigned long)sc); - atomic_set(&sc->poison, 0); - INIT_WORK(&sc->reset_work, ub_reset_task); - init_waitqueue_head(&sc->reset_wait); - - init_timer(&sc->work_timer); - sc->work_timer.data = (unsigned long) sc; - sc->work_timer.function = ub_urb_timeout; - - ub_init_completion(&sc->work_done); - sc->work_done.done = 1; /* A little yuk, but oh well... */ - - sc->dev = interface_to_usbdev(intf); - sc->intf = intf; - // sc->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; - usb_set_intfdata(intf, sc); - usb_get_dev(sc->dev); - /* - * Since we give the interface struct to the block level through - * disk->driverfs_dev, we have to pin it. Otherwise, block_uevent - * oopses on close after a disconnect (kernels 2.6.16 and up). - */ - usb_get_intf(sc->intf); - - snprintf(sc->name, 12, DRV_NAME "(%d.%d)", - sc->dev->bus->busnum, sc->dev->devnum); - - /* XXX Verify that we can handle the device (from descriptors) */ - - if (ub_get_pipes(sc, sc->dev, intf) != 0) - goto err_dev_desc; - - /* - * At this point, all USB initialization is done, do upper layer. - * We really hate halfway initialized structures, so from the - * invariants perspective, this ub_dev is fully constructed at - * this point. - */ - - /* - * This is needed to clear toggles. It is a problem only if we do - * `rmmod ub && modprobe ub` without disconnects, but we like that. - */ -#if 0 /* iPod Mini fails if we do this (big white iPod works) */ - ub_probe_clear_stall(sc, sc->recv_bulk_pipe); - ub_probe_clear_stall(sc, sc->send_bulk_pipe); -#endif - - /* - * The way this is used by the startup code is a little specific. - * A SCSI check causes a USB stall. Our common case code sees it - * and clears the check, after which the device is ready for use. - * But if a check was not present, any command other than - * TEST_UNIT_READY ends with a lockup (including REQUEST_SENSE). - * - * If we neglect to clear the SCSI check, the first real command fails - * (which is the capacity readout). We clear that and retry, but why - * causing spurious retries for no reason. - * - * Revalidation may start with its own TEST_UNIT_READY, but that one - * has to succeed, so we clear checks with an additional one here. - * In any case it's not our business how revaliadation is implemented. - */ - for (i = 0; i < 3; i++) { /* Retries for the schwag key from KS'04 */ - if ((rc = ub_sync_tur(sc, NULL)) <= 0) break; - if (rc != 0x6) break; - msleep(10); - } - - nluns = 1; - for (i = 0; i < 3; i++) { - if ((rc = ub_sync_getmaxlun(sc)) < 0) - break; - if (rc != 0) { - nluns = rc; - break; - } - msleep(100); - } - - for (i = 0; i < nluns; i++) { - ub_probe_lun(sc, i); - } - return 0; - -err_dev_desc: - usb_set_intfdata(intf, NULL); - usb_put_intf(sc->intf); - usb_put_dev(sc->dev); - kfree(sc); -err_core: - return rc; -} - -static int ub_probe_lun(struct ub_dev *sc, int lnum) -{ - struct ub_lun *lun; - struct request_queue *q; - struct gendisk *disk; - int rc; - - rc = -ENOMEM; - if ((lun = kzalloc(sizeof(struct ub_lun), GFP_KERNEL)) == NULL) - goto err_alloc; - lun->num = lnum; - - rc = -ENOSR; - if ((lun->id = ub_id_get()) == -1) - goto err_id; - - lun->udev = sc; - - snprintf(lun->name, 16, DRV_NAME "%c(%d.%d.%d)", - lun->id + 'a', sc->dev->bus->busnum, sc->dev->devnum, lun->num); - - lun->removable = 1; /* XXX Query this from the device */ - lun->changed = 1; /* ub_revalidate clears only */ - ub_revalidate(sc, lun); - - rc = -ENOMEM; - if ((disk = alloc_disk(UB_PARTS_PER_LUN)) == NULL) - goto err_diskalloc; - - sprintf(disk->disk_name, DRV_NAME "%c", lun->id + 'a'); - disk->major = UB_MAJOR; - disk->first_minor = lun->id * UB_PARTS_PER_LUN; - disk->fops = &ub_bd_fops; - disk->private_data = lun; - disk->driverfs_dev = &sc->intf->dev; - - rc = -ENOMEM; - if ((q = blk_init_queue(ub_request_fn, sc->lock)) == NULL) - goto err_blkqinit; - - disk->queue = q; - - blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH); - blk_queue_max_segments(q, UB_MAX_REQ_SG); - blk_queue_segment_boundary(q, 0xffffffff); /* Dubious. */ - blk_queue_max_hw_sectors(q, UB_MAX_SECTORS); - blk_queue_logical_block_size(q, lun->capacity.bsize); - - lun->disk = disk; - q->queuedata = lun; - list_add(&lun->link, &sc->luns); - - set_capacity(disk, lun->capacity.nsec); - if (lun->removable) - disk->flags |= GENHD_FL_REMOVABLE; - - add_disk(disk); - - return 0; - -err_blkqinit: - put_disk(disk); -err_diskalloc: - ub_id_put(lun->id); -err_id: - kfree(lun); -err_alloc: - return rc; -} - -static void ub_disconnect(struct usb_interface *intf) -{ - struct ub_dev *sc = usb_get_intfdata(intf); - struct ub_lun *lun; - unsigned long flags; - - /* - * Prevent ub_bd_release from pulling the rug from under us. - * XXX This is starting to look like a kref. - * XXX Why not to take this ref at probe time? - */ - spin_lock_irqsave(&ub_lock, flags); - sc->openc++; - spin_unlock_irqrestore(&ub_lock, flags); - - /* - * Fence stall clearings, operations triggered by unlinkings and so on. - * We do not attempt to unlink any URBs, because we do not trust the - * unlink paths in HC drivers. Also, we get -84 upon disconnect anyway. - */ - atomic_set(&sc->poison, 1); - - /* - * Wait for reset to end, if any. - */ - wait_event(sc->reset_wait, !sc->reset); - - /* - * Blow away queued commands. - * - * Actually, this never works, because before we get here - * the HCD terminates outstanding URB(s). It causes our - * SCSI command queue to advance, commands fail to submit, - * and the whole queue drains. So, we just use this code to - * print warnings. - */ - spin_lock_irqsave(sc->lock, flags); - { - struct ub_scsi_cmd *cmd; - int cnt = 0; - while ((cmd = ub_cmdq_peek(sc)) != NULL) { - cmd->error = -ENOTCONN; - cmd->state = UB_CMDST_DONE; - ub_cmdq_pop(sc); - (*cmd->done)(sc, cmd); - cnt++; - } - if (cnt != 0) { - printk(KERN_WARNING "%s: " - "%d was queued after shutdown\n", sc->name, cnt); - } - } - spin_unlock_irqrestore(sc->lock, flags); - - /* - * Unregister the upper layer. - */ - list_for_each_entry(lun, &sc->luns, link) { - del_gendisk(lun->disk); - /* - * I wish I could do: - * queue_flag_set(QUEUE_FLAG_DEAD, q); - * As it is, we rely on our internal poisoning and let - * the upper levels to spin furiously failing all the I/O. - */ - } - - /* - * Testing for -EINPROGRESS is always a bug, so we are bending - * the rules a little. - */ - spin_lock_irqsave(sc->lock, flags); - if (sc->work_urb.status == -EINPROGRESS) { /* janitors: ignore */ - printk(KERN_WARNING "%s: " - "URB is active after disconnect\n", sc->name); - } - spin_unlock_irqrestore(sc->lock, flags); - - /* - * There is virtually no chance that other CPU runs a timeout so long - * after ub_urb_complete should have called del_timer, but only if HCD - * didn't forget to deliver a callback on unlink. - */ - del_timer_sync(&sc->work_timer); - - /* - * At this point there must be no commands coming from anyone - * and no URBs left in transit. - */ - - ub_put(sc); -} - -static struct usb_driver ub_driver = { - .name = "ub", - .probe = ub_probe, - .disconnect = ub_disconnect, - .id_table = ub_usb_ids, - .pre_reset = ub_pre_reset, - .post_reset = ub_post_reset, -}; - -static int __init ub_init(void) -{ - int rc; - int i; - - pr_info("'Low Performance USB Block' driver is deprecated. " - "Please switch to usb-storage\n"); - for (i = 0; i < UB_QLOCK_NUM; i++) - spin_lock_init(&ub_qlockv[i]); - - if ((rc = register_blkdev(UB_MAJOR, DRV_NAME)) != 0) - goto err_regblkdev; - - if ((rc = usb_register(&ub_driver)) != 0) - goto err_register; - - usb_usual_set_present(USB_US_TYPE_UB); - return 0; - -err_register: - unregister_blkdev(UB_MAJOR, DRV_NAME); -err_regblkdev: - return rc; -} - -static void __exit ub_exit(void) -{ - usb_deregister(&ub_driver); - - unregister_blkdev(UB_MAJOR, DRV_NAME); - usb_usual_clear_present(USB_US_TYPE_UB); -} - -module_init(ub_init); -module_exit(ub_exit); - -MODULE_LICENSE("GPL"); |