diff options
author | Boaz Harrosh <bharrosh@panasas.com> | 2007-08-22 19:10:45 +0300 |
---|---|---|
committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-01-11 18:22:38 -0600 |
commit | 48c23d3e377bb090bf49ea6c45d024b4c11439b0 (patch) | |
tree | d42df8442f40dad0442f73e5e3760302d94e2b31 /drivers/usb/storage | |
parent | 6d416e6173394defda5933e419e805b696681b7e (diff) | |
download | linux-48c23d3e377bb090bf49ea6c45d024b4c11439b0.tar.gz linux-48c23d3e377bb090bf49ea6c45d024b4c11439b0.tar.bz2 linux-48c23d3e377bb090bf49ea6c45d024b4c11439b0.zip |
[SCSI] isd200: use one-element sg list in issuing commands
- This patch should be commited before:
usb: transport - convert to accessors and !use_sg code path removal
- isd200_action() was still using direct liniar pointers in issuing
commands to the USB transport level. This is no longer supported,
use one-element scatterlist instead.
- Adjustment of command's length in the case of scsi-to-ata translation
is now restored before return to queuecommand, since other wise it can
leak BIOs.
- isd200_action() return Error on unknown requests. Used to print an error
but still try to send garbage cdb.
- convert few places to scsi data accessors.
- Todo: This file will need to be changed when scsi_cmnd changes to
scsi_data_buffer or any other solution.
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Acked-by: Matthew Dharm <mdharm-scsi@one-eyed-alien.net>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/usb/storage')
-rw-r--r-- | drivers/usb/storage/isd200.c | 66 |
1 files changed, 46 insertions, 20 deletions
diff --git a/drivers/usb/storage/isd200.c b/drivers/usb/storage/isd200.c index 49ba6c0ff1e8..178e8c2a8a2f 100644 --- a/drivers/usb/storage/isd200.c +++ b/drivers/usb/storage/isd200.c @@ -49,6 +49,7 @@ #include <linux/slab.h> #include <linux/hdreg.h> #include <linux/ide.h> +#include <linux/scatterlist.h> #include <scsi/scsi.h> #include <scsi/scsi_cmnd.h> @@ -287,6 +288,7 @@ struct isd200_info { /* maximum number of LUNs supported */ unsigned char MaxLUNs; struct scsi_cmnd srb; + struct scatterlist sg; }; @@ -398,6 +400,31 @@ static void isd200_build_sense(struct us_data *us, struct scsi_cmnd *srb) * Transport routines ***********************************************************************/ +/************************************************************************** + * isd200_set_srb(), isd200_srb_set_bufflen() + * + * Two helpers to facilitate in initialization of scsi_cmnd structure + * Will need to change when struct scsi_cmnd changes + */ +static void isd200_set_srb(struct isd200_info *info, + enum dma_data_direction dir, void* buff, unsigned bufflen) +{ + struct scsi_cmnd *srb = &info->srb; + + if (buff) + sg_init_one(&info->sg, buff, bufflen); + + srb->sc_data_direction = dir; + srb->request_buffer = buff ? &info->sg : NULL; + srb->request_bufflen = bufflen; + srb->use_sg = buff ? 1 : 0; +} + +static void isd200_srb_set_bufflen(struct scsi_cmnd *srb, unsigned bufflen) +{ + srb->request_bufflen = bufflen; +} + /************************************************************************** * isd200_action @@ -432,9 +459,7 @@ static int isd200_action( struct us_data *us, int action, ata.generic.RegisterSelect = REG_CYLINDER_LOW | REG_CYLINDER_HIGH | REG_STATUS | REG_ERROR; - srb->sc_data_direction = DMA_FROM_DEVICE; - srb->request_buffer = pointer; - srb->request_bufflen = value; + isd200_set_srb(info, DMA_FROM_DEVICE, pointer, value); break; case ACTION_ENUM: @@ -444,7 +469,7 @@ static int isd200_action( struct us_data *us, int action, ACTION_SELECT_5; ata.generic.RegisterSelect = REG_DEVICE_HEAD; ata.write.DeviceHeadByte = value; - srb->sc_data_direction = DMA_NONE; + isd200_set_srb(info, DMA_NONE, NULL, 0); break; case ACTION_RESET: @@ -453,7 +478,7 @@ static int isd200_action( struct us_data *us, int action, ACTION_SELECT_3|ACTION_SELECT_4; ata.generic.RegisterSelect = REG_DEVICE_CONTROL; ata.write.DeviceControlByte = ATA_DC_RESET_CONTROLLER; - srb->sc_data_direction = DMA_NONE; + isd200_set_srb(info, DMA_NONE, NULL, 0); break; case ACTION_REENABLE: @@ -462,7 +487,7 @@ static int isd200_action( struct us_data *us, int action, ACTION_SELECT_3|ACTION_SELECT_4; ata.generic.RegisterSelect = REG_DEVICE_CONTROL; ata.write.DeviceControlByte = ATA_DC_REENABLE_CONTROLLER; - srb->sc_data_direction = DMA_NONE; + isd200_set_srb(info, DMA_NONE, NULL, 0); break; case ACTION_SOFT_RESET: @@ -471,21 +496,20 @@ static int isd200_action( struct us_data *us, int action, ata.generic.RegisterSelect = REG_DEVICE_HEAD | REG_COMMAND; ata.write.DeviceHeadByte = info->DeviceHead; ata.write.CommandByte = WIN_SRST; - srb->sc_data_direction = DMA_NONE; + isd200_set_srb(info, DMA_NONE, NULL, 0); break; case ACTION_IDENTIFY: US_DEBUGP(" isd200_action(IDENTIFY)\n"); ata.generic.RegisterSelect = REG_COMMAND; ata.write.CommandByte = WIN_IDENTIFY; - srb->sc_data_direction = DMA_FROM_DEVICE; - srb->request_buffer = (void *) info->id; - srb->request_bufflen = sizeof(struct hd_driveid); + isd200_set_srb(info, DMA_FROM_DEVICE, info->id, + sizeof(struct hd_driveid)); break; default: US_DEBUGP("Error: Undefined action %d\n",action); - break; + return ISD200_ERROR; } memcpy(srb->cmnd, &ata, sizeof(ata.generic)); @@ -590,7 +614,7 @@ static void isd200_invoke_transport( struct us_data *us, return; } - if ((srb->resid > 0) && + if ((scsi_get_resid(srb) > 0) && !((srb->cmnd[0] == REQUEST_SENSE) || (srb->cmnd[0] == INQUIRY) || (srb->cmnd[0] == MODE_SENSE) || @@ -1217,7 +1241,6 @@ static int isd200_get_inquiry_data( struct us_data *us ) return(retStatus); } - /************************************************************************** * isd200_scsi_to_ata * @@ -1266,7 +1289,7 @@ static int isd200_scsi_to_ata(struct scsi_cmnd *srb, struct us_data *us, ataCdb->generic.TransferBlockSize = 1; ataCdb->generic.RegisterSelect = REG_COMMAND; ataCdb->write.CommandByte = ATA_COMMAND_GET_MEDIA_STATUS; - srb->request_bufflen = 0; + isd200_srb_set_bufflen(srb, 0); } else { US_DEBUGP(" Media Status not supported, just report okay\n"); srb->result = SAM_STAT_GOOD; @@ -1284,7 +1307,7 @@ static int isd200_scsi_to_ata(struct scsi_cmnd *srb, struct us_data *us, ataCdb->generic.TransferBlockSize = 1; ataCdb->generic.RegisterSelect = REG_COMMAND; ataCdb->write.CommandByte = ATA_COMMAND_GET_MEDIA_STATUS; - srb->request_bufflen = 0; + isd200_srb_set_bufflen(srb, 0); } else { US_DEBUGP(" Media Status not supported, just report okay\n"); srb->result = SAM_STAT_GOOD; @@ -1390,7 +1413,7 @@ static int isd200_scsi_to_ata(struct scsi_cmnd *srb, struct us_data *us, ataCdb->generic.RegisterSelect = REG_COMMAND; ataCdb->write.CommandByte = (srb->cmnd[4] & 0x1) ? WIN_DOORLOCK : WIN_DOORUNLOCK; - srb->request_bufflen = 0; + isd200_srb_set_bufflen(srb, 0); } else { US_DEBUGP(" Not removeable media, just report okay\n"); srb->result = SAM_STAT_GOOD; @@ -1416,7 +1439,7 @@ static int isd200_scsi_to_ata(struct scsi_cmnd *srb, struct us_data *us, ataCdb->generic.TransferBlockSize = 1; ataCdb->generic.RegisterSelect = REG_COMMAND; ataCdb->write.CommandByte = ATA_COMMAND_GET_MEDIA_STATUS; - srb->request_bufflen = 0; + isd200_srb_set_bufflen(srb, 0); } else { US_DEBUGP(" Nothing to do, just report okay\n"); srb->result = SAM_STAT_GOOD; @@ -1525,7 +1548,7 @@ int isd200_Initialization(struct us_data *us) void isd200_ata_command(struct scsi_cmnd *srb, struct us_data *us) { - int sendToTransport = 1; + int sendToTransport = 1, orig_bufflen; union ata_cdb ataCdb; /* Make sure driver was initialized */ @@ -1533,11 +1556,14 @@ void isd200_ata_command(struct scsi_cmnd *srb, struct us_data *us) if (us->extra == NULL) US_DEBUGP("ERROR Driver not initialized\n"); - /* Convert command */ - srb->resid = 0; + scsi_set_resid(srb, 0); + /* scsi_bufflen might change in protocol translation to ata */ + orig_bufflen = scsi_bufflen(srb); sendToTransport = isd200_scsi_to_ata(srb, us, &ataCdb); /* send the command to the transport layer */ if (sendToTransport) isd200_invoke_transport(us, srb, &ataCdb); + + isd200_srb_set_bufflen(srb, orig_bufflen); } |