]> git.karo-electronics.de Git - linux-beck.git/commitdiff
dm mpath: check if path's request_queue is dying in activate_path()
authorMike Snitzer <snitzer@redhat.com>
Thu, 1 Sep 2016 16:06:37 +0000 (12:06 -0400)
committerMike Snitzer <snitzer@redhat.com>
Wed, 14 Sep 2016 17:56:38 +0000 (13:56 -0400)
If pg_init_retries is set and a request is queued against a multipath
device with all underlying block device request_queues in the "dying"
state then an infinite loop is triggered because activate_path() never
succeeds and hence never calls pg_init_done().

This change avoids that device removal triggers an infinite loop by
failing the activate_path() which causes the "dying" path to be failed.

Reported-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
drivers/md/dm-mpath.c

index ac734e5bbe486b52532fbd5a70edc8bf036990a3..15db5e9c572e3bdc67a00f0610749ea8dc597dd3 100644 (file)
@@ -1521,10 +1521,10 @@ static void activate_path(struct work_struct *work)
 {
        struct pgpath *pgpath =
                container_of(work, struct pgpath, activate_path.work);
+       struct request_queue *q = bdev_get_queue(pgpath->path.dev->bdev);
 
-       if (pgpath->is_active)
-               scsi_dh_activate(bdev_get_queue(pgpath->path.dev->bdev),
-                                pg_init_done, pgpath);
+       if (pgpath->is_active && !blk_queue_dying(q))
+               scsi_dh_activate(q, pg_init_done, pgpath);
        else
                pg_init_done(pgpath, SCSI_DH_DEV_OFFLINED);
 }