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Date: Sun, 5 Feb 2017 20:22:19 +0100 From: Willy Tarreau <w@....eu> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, linux@...ck-us.net Cc: Bart Van Assche <bart.vanassche@...disk.com>, Mike Snitzer <snitzer@...hat.com>, Jiri Slaby <jslaby@...e.cz>, Willy Tarreau <w@....eu> Subject: [PATCH 3.10 317/319] dm: mark request_queue dead before destroying the DM device From: Bart Van Assche <bart.vanassche@...disk.com> commit 3b785fbcf81c3533772c52b717f77293099498d3 upstream. This avoids that new requests are queued while __dm_destroy() is in progress. [js] use md->queue instead of non-present helper Signed-off-by: Bart Van Assche <bart.vanassche@...disk.com> Signed-off-by: Mike Snitzer <snitzer@...hat.com> Signed-off-by: Jiri Slaby <jslaby@...e.cz> Signed-off-by: Willy Tarreau <w@....eu> --- drivers/md/dm.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index f69fed8..a77ef6c 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -2323,6 +2323,7 @@ EXPORT_SYMBOL_GPL(dm_device_name); static void __dm_destroy(struct mapped_device *md, bool wait) { + struct request_queue *q = md->queue; struct dm_table *map; might_sleep(); @@ -2333,6 +2334,10 @@ static void __dm_destroy(struct mapped_device *md, bool wait) set_bit(DMF_FREEING, &md->flags); spin_unlock(&_minor_lock); + spin_lock_irq(q->queue_lock); + queue_flag_set(QUEUE_FLAG_DYING, q); + spin_unlock_irq(q->queue_lock); + /* * Take suspend_lock so that presuspend and postsuspend methods * do not race with internal suspend. -- 2.8.0.rc2.1.gbe9624a
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