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authorChristoph Hellwig <hch@lst.de>2014-11-03 16:09:02 +0300
committerChristoph Hellwig <hch@lst.de>2014-11-12 13:19:43 +0300
commit2ecb204d07ac8debe3893c362415919bc78bebd6 (patch)
treeeef99b324201b21de358dffdab8bfc0453358d5f /drivers/scsi/scsi.c
parente2eddf4d530df745019fded0fedfb78f6d3e33ca (diff)
downloadlinux-2ecb204d07ac8debe3893c362415919bc78bebd6.tar.xz
scsi: always assign block layer tags if enabled
Allow a driver to ask for block layer tags by setting .use_blk_tags in the host template, in which case it will always see a valid value in request->tag, similar to the behavior when using blk-mq. This means even SCSI "untagged" commands will now have a tag, which is especially useful when using a host-wide tag map. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Mike Christie <michaelc@cs.wisc.edu> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Hannes Reinecke <hare@suse.de>
Diffstat (limited to 'drivers/scsi/scsi.c')
-rw-r--r--drivers/scsi/scsi.c12
1 files changed, 4 insertions, 8 deletions
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 22c449e926fa..a3426f1bf0dd 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -864,16 +864,12 @@ EXPORT_SYMBOL(scsi_track_queue_full);
*/
int scsi_change_queue_type(struct scsi_device *sdev, int tag_type)
{
- if (sdev->tagged_supported) {
- scsi_set_tag_type(sdev, tag_type);
- if (tag_type)
- scsi_activate_tcq(sdev, sdev->queue_depth);
- else
- scsi_deactivate_tcq(sdev, sdev->queue_depth);
- } else
- tag_type = 0;
+ if (!sdev->tagged_supported)
+ return 0;
+ scsi_adjust_queue_depth(sdev, tag_type, sdev->queue_depth);
return tag_type;
+
}
EXPORT_SYMBOL(scsi_change_queue_type);