diff options
| 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 | |
| parent | 865b58c05b841964f48f574c2027311bd04db8a1 (diff) | |
[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>
| -rw-r--r-- | drivers/scsi/scsi_error.c | 8 | ||||
| -rw-r--r-- | include/scsi/scsi_cmnd.h | 12 |
2 files changed, 7 insertions, 13 deletions
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index de2337f255a..c1b05a83d40 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; } diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h index ac06cc59589..de5f5d8f1f8 100644 --- a/include/scsi/scsi_cmnd.h +++ b/include/scsi/scsi_cmnd.h @@ -132,18 +132,10 @@ struct scsi_cmnd { unsigned char tag; /* SCSI-II queued command tag */ }; +/* make sure not to use it with REQ_TYPE_BLOCK_PC commands */ static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd) { - struct scsi_driver **sdp; - - if (!cmd->request->rq_disk) - return NULL; - - sdp = (struct scsi_driver **)cmd->request->rq_disk->private_data; - if (!sdp) - return NULL; - - return *sdp; + return *(struct scsi_driver **)cmd->request->rq_disk->private_data; } extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t); |