diff options
| -rw-r--r-- | drivers/scsi/st.c | 202 |
1 files changed, 66 insertions, 136 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index fe4c20259bca..ddf2630b3479 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -17,7 +17,7 @@ Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support */ -static const char *verstr = "20080504"; +static const char *verstr = "20081215"; #include <linux/module.h> @@ -491,10 +491,13 @@ static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd, mdata->null_mapped = 1; - err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, GFP_KERNEL); - if (err) { - blk_put_request(req); - return DRIVER_ERROR << 24; + if (bufflen) { + err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, + GFP_KERNEL); + if (err) { + blk_put_request(req); + return DRIVER_ERROR << 24; + } } SRpnt->bio = req->bio; @@ -577,28 +580,6 @@ st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd return SRpnt; } -static int st_scsi_kern_execute(struct st_request *streq, - const unsigned char *cmd, int data_direction, - void *buffer, unsigned bufflen, int timeout, - int retries) -{ - struct scsi_tape *stp = streq->stp; - int ret, resid; - - stp->buffer->cmdstat.have_sense = 0; - memcpy(streq->cmd, cmd, sizeof(streq->cmd)); - - ret = scsi_execute(stp->device, cmd, data_direction, buffer, bufflen, - streq->sense, timeout, retries, 0, &resid); - if (driver_byte(ret) & DRIVER_ERROR) - return -EBUSY; - - stp->buffer->cmdstat.midlevel_result = streq->result = ret; - stp->buffer->cmdstat.residual = resid; - stp->buffer->syscall_result = st_chk_result(stp, streq); - - return 0; -} /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if write has been correct but EOM early warning reached, -EIO if write ended in @@ -671,7 +652,6 @@ static int cross_eof(struct scsi_tape * STp, int forward) { struct st_request *SRpnt; unsigned char cmd[MAX_COMMAND_SIZE]; - int ret; cmd[0] = SPACE; cmd[1] = 0x01; /* Space FileMarks */ @@ -685,26 +665,20 @@ static int cross_eof(struct scsi_tape * STp, int forward) DEBC(printk(ST_DEB_MSG "%s: Stepping over filemark %s.\n", tape_name(STp), forward ? "forward" : "backward")); - SRpnt = st_allocate_request(STp); + SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, + STp->device->request_queue->rq_timeout, + MAX_RETRIES, 1); if (!SRpnt) - return STp->buffer->syscall_result; - - ret = st_scsi_kern_execute(SRpnt, cmd, DMA_NONE, NULL, 0, - STp->device->request_queue->rq_timeout, - MAX_RETRIES); - if (ret) - goto out; + return (STp->buffer)->syscall_result; - ret = STp->buffer->syscall_result; + st_release_request(SRpnt); + SRpnt = NULL; if ((STp->buffer)->cmdstat.midlevel_result != 0) printk(KERN_ERR "%s: Stepping over filemark %s failed.\n", tape_name(STp), forward ? "forward" : "backward"); -out: - st_release_request(SRpnt); - - return ret; + return (STp->buffer)->syscall_result; } @@ -925,24 +899,21 @@ static int test_ready(struct scsi_tape *STp, int do_wait) int attentions, waits, max_wait, scode; int retval = CHKRES_READY, new_session = 0; unsigned char cmd[MAX_COMMAND_SIZE]; - struct st_request *SRpnt; + struct st_request *SRpnt = NULL; struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; - SRpnt = st_allocate_request(STp); - if (!SRpnt) - return STp->buffer->syscall_result; - max_wait = do_wait ? ST_BLOCK_SECONDS : 0; for (attentions=waits=0; ; ) { memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); cmd[0] = TEST_UNIT_READY; + SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, + STp->long_timeout, MAX_READY_RETRIES, 1); - retval = st_scsi_kern_execute(SRpnt, cmd, DMA_NONE, NULL, 0, - STp->long_timeout, - MAX_READY_RETRIES); - if (retval) + if (!SRpnt) { + retval = (STp->buffer)->syscall_result; break; + } if (cmdstatp->have_sense) { @@ -986,8 +957,8 @@ static int test_ready(struct scsi_tape *STp, int do_wait) break; } - st_release_request(SRpnt); - + if (SRpnt != NULL) + st_release_request(SRpnt); return retval; } @@ -1064,24 +1035,17 @@ static int check_tape(struct scsi_tape *STp, struct file *filp) } } - SRpnt = st_allocate_request(STp); - if (!SRpnt) { - retval = STp->buffer->syscall_result; - goto err_out; - } - if (STp->omit_blklims) STp->min_block = STp->max_block = (-1); else { memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); cmd[0] = READ_BLOCK_LIMITS; - retval = st_scsi_kern_execute(SRpnt, cmd, DMA_FROM_DEVICE, - STp->buffer->b_data, 6, - STp->device->request_queue->rq_timeout, - MAX_READY_RETRIES); - if (retval) { - st_release_request(SRpnt); + SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE, + STp->device->request_queue->rq_timeout, + MAX_READY_RETRIES, 1); + if (!SRpnt) { + retval = (STp->buffer)->syscall_result; goto err_out; } @@ -1105,12 +1069,11 @@ static int check_tape(struct scsi_tape *STp, struct file *filp) cmd[0] = MODE_SENSE; cmd[4] = 12; - retval = st_scsi_kern_execute(SRpnt, cmd, DMA_FROM_DEVICE, - STp->buffer->b_data, 12, - STp->device->request_queue->rq_timeout, - MAX_READY_RETRIES); - if (retval) { - st_release_request(SRpnt); + SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE, + STp->device->request_queue->rq_timeout, + MAX_READY_RETRIES, 1); + if (!SRpnt) { + retval = (STp->buffer)->syscall_result; goto err_out; } @@ -1340,17 +1303,11 @@ static int st_flush(struct file *filp, fl_owner_t id) cmd[0] = WRITE_FILEMARKS; cmd[4] = 1 + STp->two_fm; - SRpnt = st_allocate_request(STp); + SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, + STp->device->request_queue->rq_timeout, + MAX_WRITE_RETRIES, 1); if (!SRpnt) { - result = STp->buffer->syscall_result; - goto out; - } - - result = st_scsi_kern_execute(SRpnt, cmd, DMA_NONE, NULL, 0, - STp->device->request_queue->rq_timeout, - MAX_WRITE_RETRIES); - if (result) { - st_release_request(SRpnt); + result = (STp->buffer)->syscall_result; goto out; } @@ -2415,7 +2372,6 @@ static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) { unsigned char cmd[MAX_COMMAND_SIZE]; struct st_request *SRpnt; - int ret; memset(cmd, 0, MAX_COMMAND_SIZE); cmd[0] = MODE_SENSE; @@ -2424,17 +2380,14 @@ static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) cmd[2] = page; cmd[4] = 255; - SRpnt = st_allocate_request(STp); - if (!SRpnt) - return STp->buffer->syscall_result; + SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE, + STp->device->request_queue->rq_timeout, 0, 1); + if (SRpnt == NULL) + return (STp->buffer)->syscall_result; - ret = st_scsi_kern_execute(SRpnt, cmd, DMA_FROM_DEVICE, - STp->buffer->b_data, cmd[4], - STp->device->request_queue->rq_timeout, - MAX_RETRIES); st_release_request(SRpnt); - return ret ? : STp->buffer->syscall_result; + return STp->buffer->syscall_result; } @@ -2442,9 +2395,10 @@ static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */ static int write_mode_page(struct scsi_tape *STp, int page, int slow) { - int pgo, timeout, ret = 0; + int pgo; unsigned char cmd[MAX_COMMAND_SIZE]; struct st_request *SRpnt; + int timeout; memset(cmd, 0, MAX_COMMAND_SIZE); cmd[0] = MODE_SELECT; @@ -2458,21 +2412,16 @@ static int write_mode_page(struct scsi_tape *STp, int page, int slow) (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP; (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR; - SRpnt = st_allocate_request(STp); - if (!SRpnt) - return ret; - - timeout = slow ? STp->long_timeout : - STp->device->request_queue->rq_timeout; - - ret = st_scsi_kern_execute(SRpnt, cmd, DMA_TO_DEVICE, - STp->buffer->b_data, cmd[4], timeout, 0); - if (!ret) - ret = STp->buffer->syscall_result; + timeout = slow ? + STp->long_timeout : STp->device->request_queue->rq_timeout; + SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE, + timeout, 0, 1); + if (SRpnt == NULL) + return (STp->buffer)->syscall_result; st_release_request(SRpnt); - return ret; + return STp->buffer->syscall_result; } @@ -2590,16 +2539,13 @@ static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_cod printk(ST_DEB_MSG "%s: Loading tape.\n", name); ); - SRpnt = st_allocate_request(STp); + SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, + timeout, MAX_RETRIES, 1); if (!SRpnt) - return STp->buffer->syscall_result; - - retval = st_scsi_kern_execute(SRpnt, cmd, DMA_NONE, NULL, 0, timeout, - MAX_RETRIES); - if (retval) - goto out; + return (STp->buffer)->syscall_result; retval = (STp->buffer)->syscall_result; + st_release_request(SRpnt); if (!retval) { /* SCSI command successful */ @@ -2618,8 +2564,6 @@ static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_cod STps = &(STp->ps[STp->partition]); STps->drv_file = STps->drv_block = (-1); } -out: - st_release_request(SRpnt); return retval; } @@ -2895,15 +2839,12 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon return (-ENOSYS); } - SRpnt = st_allocate_request(STp); + SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, + timeout, MAX_RETRIES, 1); if (!SRpnt) return (STp->buffer)->syscall_result; - ioctl_result = st_scsi_kern_execute(SRpnt, cmd, direction, - STp->buffer->b_data, datalen, - timeout, MAX_RETRIES); - if (!ioctl_result) - ioctl_result = (STp->buffer)->syscall_result; + ioctl_result = (STp->buffer)->syscall_result; if (!ioctl_result) { /* SCSI command successful */ st_release_request(SRpnt); @@ -3065,17 +3006,11 @@ static int get_location(struct scsi_tape *STp, unsigned int *block, int *partiti if (!logical && !STp->scsi2_logical) scmd[1] = 1; } - - SRpnt = st_allocate_request(STp); + SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, + STp->device->request_queue->rq_timeout, + MAX_READY_RETRIES, 1); if (!SRpnt) - return STp->buffer->syscall_result; - - result = st_scsi_kern_execute(SRpnt, scmd, DMA_FROM_DEVICE, - STp->buffer->b_data, 20, - STp->device->request_queue->rq_timeout, - MAX_READY_RETRIES); - if (result) - goto out; + return (STp->buffer)->syscall_result; if ((STp->buffer)->syscall_result != 0 || (STp->device->scsi_level >= SCSI_2 && @@ -3103,7 +3038,6 @@ static int get_location(struct scsi_tape *STp, unsigned int *block, int *partiti DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name, *block, *partition)); } -out: st_release_request(SRpnt); SRpnt = NULL; @@ -3178,14 +3112,10 @@ static int set_location(struct scsi_tape *STp, unsigned int block, int partition timeout = STp->device->request_queue->rq_timeout; } - SRpnt = st_allocate_request(STp); + SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, + timeout, MAX_READY_RETRIES, 1); if (!SRpnt) - return STp->buffer->syscall_result; - - result = st_scsi_kern_execute(SRpnt, scmd, DMA_NONE, NULL, 0, - timeout, MAX_READY_RETRIES); - if (result) - goto out; + return (STp->buffer)->syscall_result; STps->drv_block = STps->drv_file = (-1); STps->eof = ST_NOEOF; @@ -3210,7 +3140,7 @@ static int set_location(struct scsi_tape *STp, unsigned int block, int partition STps->drv_block = STps->drv_file = 0; result = 0; } -out: + st_release_request(SRpnt); SRpnt = NULL; |