diff options
| author | Bart Van Assche <bart.vanassche@wdc.com> | 2017-08-25 23:46:32 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2017-08-26 00:08:07 +0300 |
| commit | bed2213d01de474eb8a6f3891070eec6be6fe772 (patch) | |
| tree | 7cf1ff22eb30ec502abf3f5155cb04ef64d9a72c /drivers/scsi/scsi_lib.c | |
| parent | e7008ff5c61a13e673344d3048baaf8e0652fa87 (diff) | |
| download | linux-bed2213d01de474eb8a6f3891070eec6be6fe772.tar.xz | |
scsi: Use blk_mq_rq_to_pdu() to convert a request to a SCSI command pointer
Since commit e9c787e65c0c ("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>
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 9e8ce0d66c5a..0270b35f7680 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -627,7 +627,7 @@ static void scsi_release_bidi_buffers(struct scsi_cmnd *cmd) static bool scsi_end_request(struct request *req, blk_status_t error, unsigned int bytes, unsigned int bidi_bytes) { - struct scsi_cmnd *cmd = req->special; + struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req); struct scsi_device *sdev = cmd->device; struct request_queue *q = sdev->request_queue; @@ -1171,7 +1171,7 @@ void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd) static int scsi_setup_scsi_cmnd(struct scsi_device *sdev, struct request *req) { - struct scsi_cmnd *cmd = req->special; + struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req); /* * Passthrough requests may transfer data, in which case they must @@ -1202,7 +1202,7 @@ static int scsi_setup_scsi_cmnd(struct scsi_device *sdev, struct request *req) */ static int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req) { - struct scsi_cmnd *cmd = req->special; + struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req); if (unlikely(sdev->handler && sdev->handler->prep_fn)) { int ret = sdev->handler->prep_fn(sdev, req); @@ -1217,7 +1217,7 @@ static int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req) static int scsi_setup_cmnd(struct scsi_device *sdev, struct request *req) { - struct scsi_cmnd *cmd = req->special; + struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req); if (!blk_rq_bytes(req)) cmd->sc_data_direction = DMA_NONE; @@ -1354,7 +1354,7 @@ out: static void scsi_unprep_fn(struct request_queue *q, struct request *req) { - scsi_uninit_cmd(req->special); + scsi_uninit_cmd(blk_mq_rq_to_pdu(req)); } /* @@ -1545,7 +1545,7 @@ static int scsi_lld_busy(struct request_queue *q) */ static void scsi_kill_request(struct request *req, struct request_queue *q) { - struct scsi_cmnd *cmd = req->special; + struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req); struct scsi_device *sdev; struct scsi_target *starget; struct Scsi_Host *shost; @@ -1576,7 +1576,7 @@ static void scsi_kill_request(struct request *req, struct request_queue *q) static void scsi_softirq_done(struct request *rq) { - struct scsi_cmnd *cmd = rq->special; + struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq); unsigned long wait_for = (cmd->allowed + 1) * rq->timeout; int disposition; @@ -1764,8 +1764,8 @@ static void scsi_request_fn(struct request_queue *q) blk_start_request(req); spin_unlock_irq(q->queue_lock); - cmd = req->special; - if (unlikely(cmd == NULL)) { + cmd = blk_mq_rq_to_pdu(req); + if (cmd != req->special) { printk(KERN_CRIT "impossible request in %s.\n" "please mail a stack trace to " "linux-scsi@vger.kernel.org\n", |