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)
commitf10e06b744074824fb8ec7066bc03ecc90918f5b
tree59189371f796e6d40d9f0c77ca6e8b1b66dc86df
parent9dbeaeabacb26260d1621fe58f0f6fdedc8860d4
dm mpath: check if path's request_queue is dying in activate_path()

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