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authorLi Zhong <zhong@linux.vnet.ibm.com>2012-09-29 12:23:37 +0800
committerJames Bottomley <JBottomley@Parallels.com>2012-10-09 12:04:42 +0100
commit329a402cb052b233bc92aa34c4caf2f7dfb2d76e (patch)
treec58a423318703fc41a61641aef2720d48640f25d /include/scsi
parent865b58c05b841964f48f574c2027311bd04db8a1 (diff)
downloadlinux-linaro-stable-329a402cb052b233bc92aa34c4caf2f7dfb2d76e.tar.gz
[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 'include/scsi')
-rw-r--r--include/scsi/scsi_cmnd.h12
1 files changed, 2 insertions, 10 deletions
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index ac06cc595890..de5f5d8f1f8a 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);