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scsi: Use blk_mq_rq_to_pdu() to convert a request to a SCSI command pointer

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Since commit e9c787e65c ("scsi: allocate scsi_cmnd structures as
part of struct request") struct request and struct scsi_cmnd are
adjacent. This means that there is now an alternative to reading
req->special to convert a pointer to a prepared request into a
SCSI command pointer, namely by using blk_mq_rq_to_pdu(). Make
this change where appropriate. Although this patch does not
change any functionality, it slightly improves performance and
slightly improves readability.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche
2017-08-25 13:46:32 -07:00
committed by Martin K. Petersen
parent e7008ff5c6
commit bed2213d01
3 changed files with 11 additions and 11 deletions
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2
include/scsi/scsi_tcq.h
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@@ -39,7 +39,7 @@ static inline struct scsi_cmnd *scsi_host_find_tag(struct Scsi_Host *shost,
if (!req)
return NULL;
return req->special;
return blk_mq_rq_to_pdu(req);
}
#endif /* CONFIG_BLOCK */