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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 /include/scsi | |
| parent | 865b58c05b841964f48f574c2027311bd04db8a1 (diff) | |
| download | linux-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.h | 12 |
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); |