3.16.40-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Mike Snitzer <snitzer@xxxxxxxxxx>
commit f10e06b744074824fb8ec7066bc03ecc90918f5b upstream.
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@xxxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/md/dm-mpath.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -1196,10 +1196,10 @@ static void activate_path(struct work_st
{
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);
}