block: unify request timeout handling

Right now SCSI and others do their own command timeout handling.
Move those bits to the block layer.

Instead of having a timer per command, we try to be a bit more clever
and simply have one per-queue. This avoids the overhead of having to
tear down and setup a timer for each command, so it will result in a lot
less timer fiddling.

Signed-off-by: Mike Anderson <andmike@linux.vnet.ibm.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 8dbe3798d5fd..0f17009c99d2 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -331,7 +331,7 @@ static int sr_done(struct scsi_cmnd *SCpnt)
 
 static int sr_prep_fn(struct request_queue *q, struct request *rq)
 {
-        int block=0, this_count, s_size, timeout = SR_TIMEOUT;
+        int block = 0, this_count, s_size;
         struct scsi_cd *cd;
         struct scsi_cmnd *SCpnt;
         struct scsi_device *sdp = q->queuedata;
@@ -461,7 +461,6 @@ static int sr_prep_fn(struct request_queue *q, struct request *rq)
         SCpnt->transfersize = cd->device->sector_size;
         SCpnt->underflow = this_count << 9;
         SCpnt->allowed = MAX_RETRIES;
-        SCpnt->timeout_per_command = timeout;
 
         /*
          * This indicates that the command is ready from our end to be
@@ -620,6 +619,8 @@ static int sr_probe(struct device *dev)
         disk->fops = &sr_bdops;
         disk->flags = GENHD_FL_CD;
 
+        blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
+
         cd->device = sdev;
         cd->disk = disk;
         cd->driver = &sr_template;