scsi: only re-lock door after EH on devices that were reset

Setups that use the blk-mq I/O path can lock up if a host with a single
device that has its door locked enters EH.  Make sure to only send the
command to re-lock the door to devices that actually were reset and thus
might have lost their state.  Otherwise the EH code might be get blocked
on blk_get_request as all requests for non-reset devices might be in use.

Cc: stable@vger.kernel.org
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Meelis Roos <meelis.roos@ut.ee>
Tested-by: Meelis Roos <meelis.roos@ut.ee>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 9a6f846..c21e530 100644 (file)
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -2001,8 +2001,10 @@ static void scsi_restart_operations(struct Scsi_Host *shost)
         * is no point trying to lock the door of an off-line device.
         */
        shost_for_each_device(sdev, shost) {
-               if (scsi_device_online(sdev) && sdev->locked)
+               if (scsi_device_online(sdev) && sdev->was_reset && sdev->locked) {
                        scsi_eh_lock_door(sdev);
+                       sdev->was_reset = 0;
+               }
        }
 
        /*