This is a note to let you know that I've just added the patch titled
dm mpath: check if path's request_queue is dying in activate_path()
to the 4.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dm-mpath-check-if-path-s-request_queue-is-dying-in-activate_path.patch
and it can be found in the queue-4.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f10e06b744074824fb8ec7066bc03ecc90918f5b Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@xxxxxxxxxx>
Date: Thu, 1 Sep 2016 12:06:37 -0400
Subject: dm mpath: check if path's request_queue is dying in activate_path()
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: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -1521,10 +1521,10 @@ 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);
}
Patches currently in stable-queue which might be from snitzer@xxxxxxxxxx are
queue-4.8/dm-crypt-fix-crash-on-exit.patch
queue-4.8/dm-rq-take-request_queue-lock-while-clearing-queue_flag_stopped.patch
queue-4.8/dm-mark-request_queue-dead-before-destroying-the-dm-device.patch
queue-4.8/dm-mpath-check-if-path-s-request_queue-is-dying-in-activate_path.patch
queue-4.8/dm-return-correct-error-code-in-dm_resume-s-retry-loop.patch
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