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authorChristoph Hellwig <hch@lst.de>2014-11-13 16:25:11 +0300
committerChristoph Hellwig <hch@lst.de>2014-11-24 16:45:12 +0300
commitc40ecc12cfdb630332198a04e2832ae8218a61f1 (patch)
tree881456a7d46ca017dba4cc003e2fe1be427614fc /drivers/scsi/virtio_scsi.c
parent89dac7bb3b0494685241369951f95494e86ee61f (diff)
downloadlinux-c40ecc12cfdb630332198a04e2832ae8218a61f1.tar.xz
scsi: avoid ->change_queue_depth indirection for queue full tracking
All drivers use the implementation for ramping the queue up and down, so instead of overloading the change_queue_depth method call the implementation diretly if the driver opts into it by setting the track_queue_depth flag in the host template. Note that a few drivers validated the new queue depth in their change_queue_depth method, but as we never go over the queue depth set during slave_configure or the sysfs file this isn't nessecary and can safely be removed. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Mike Christie <michaelc@cs.wisc.edu> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Venkatesh Srinivas <venkateshs@google.com>
Diffstat (limited to 'drivers/scsi/virtio_scsi.c')
-rw-r--r--drivers/scsi/virtio_scsi.c15
1 files changed, 3 insertions, 12 deletions
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index 8e40347da0a8..0f7e4c7ff8c2 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -691,18 +691,7 @@ static int virtscsi_change_queue_depth(struct scsi_device *sdev,
struct Scsi_Host *shost = sdev->host;
int max_depth = shost->cmd_per_lun;
- switch (reason) {
- case SCSI_QDEPTH_QFULL: /* Drop qdepth in response to BUSY state */
- scsi_track_queue_full(sdev, qdepth);
- break;
- case SCSI_QDEPTH_RAMP_UP: /* Raise qdepth after BUSY state resolved */
- case SCSI_QDEPTH_DEFAULT: /* Manual change via sysfs */
- scsi_adjust_queue_depth(sdev, min(max_depth, qdepth));
- break;
- default:
- return -EOPNOTSUPP;
- }
-
+ scsi_adjust_queue_depth(sdev, min(max_depth, qdepth));
return sdev->queue_depth;
}
@@ -770,6 +759,7 @@ static struct scsi_host_template virtscsi_host_template_single = {
.use_clustering = ENABLE_CLUSTERING,
.target_alloc = virtscsi_target_alloc,
.target_destroy = virtscsi_target_destroy,
+ .track_queue_depth = 1,
};
static struct scsi_host_template virtscsi_host_template_multi = {
@@ -788,6 +778,7 @@ static struct scsi_host_template virtscsi_host_template_multi = {
.use_clustering = ENABLE_CLUSTERING,
.target_alloc = virtscsi_target_alloc,
.target_destroy = virtscsi_target_destroy,
+ .track_queue_depth = 1,
};
#define virtscsi_config_get(vdev, fld) \