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| author | Li Zhong <zhong@linux.vnet.ibm.com> | 2012-09-29 12:23:37 +0800 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2012-10-09 12:04:42 +0100 |
| commit | 329a402cb052b233bc92aa34c4caf2f7dfb2d76e (patch) | |
| tree | c58a423318703fc41a61641aef2720d48640f25d /drivers/scsi | |
| parent | 865b58c05b841964f48f574c2027311bd04db8a1 (diff) | |
| download | linux-329a402cb052b233bc92aa34c4caf2f7dfb2d76e.tar.gz linux-329a402cb052b233bc92aa34c4caf2f7dfb2d76e.tar.bz2 linux-329a402cb052b233bc92aa34c4caf2f7dfb2d76e.zip | |
[SCSI] Shorten the path length of scsi_cmd_to_driver()
This patch tries to shorten the path length of scsi_cmd_to_driver(). As only
REQ_TYPE_BLOCK_PC commands can be submitted without a driver, so we could
avoid the related NULL checking, as long as we make sure we don't use it for
REQ_TYPE_BLOCK_PC type commands. Plus, this fixes a bug where you get
different behaviors from REQ_TYPE_BLOCK_PC commands when a driver is and isn't
attached.
Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/scsi_error.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index de2337f255a7..c1b05a83d403 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -789,7 +789,6 @@ static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, int cmnd_size, int timeout, unsigned sense_bytes) { struct scsi_device *sdev = scmd->device; - struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); struct Scsi_Host *shost = sdev->host; DECLARE_COMPLETION_ONSTACK(done); unsigned long timeleft; @@ -845,8 +844,11 @@ static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, scsi_eh_restore_cmnd(scmd, &ses); - if (sdrv && sdrv->eh_action) - rtn = sdrv->eh_action(scmd, cmnd, cmnd_size, rtn); + if (scmd->request->cmd_type != REQ_TYPE_BLOCK_PC) { + struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); + if (sdrv->eh_action) + rtn = sdrv->eh_action(scmd, cmnd, cmnd_size, rtn); + } return rtn; } |