tree 9488b822407f575d6fbbdacebe61df18fe87d5da
parent e7ac6c6666bec0a354758a1298d3231e4a635362
author Jens Axboe <axboe@fb.com> 1436797479 -0600
committer James Bottomley <JBottomley@Odin.com> 1437052193 +0300

scsi: fix host max depth checking for the 'queue_depth' sysfs interface

Commit 1e6f2416044c0 changed the scsi sysfs 'queue_depth' code to
rejects depths higher than the scsi host template setting. But lots
of hosts set this to 1, and update the settings in the scsi host
when the controller/devices probing happens.

This breaks (at least) mpt2sas and mpt3sas runtime setting of queue
depth, returning EINVAL for all settings but '1'. And once it's set to
1, there's no way to go back up.

Cc: stable@vger.kernel.org
Fixes: 1e6f2416044c0 "scsi: don't allow setting of queue_depth bigger than can_queue"
Signed-off-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>