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dm: mark request_queue dead before destroying the DM device

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This avoids that new requests are queued while __dm_destroy() is in
progress.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Bart Van Assche 2016-08-31 15:17:49 -07:00 committed by Mike Snitzer
parent 8dc23658b7
commit 3b785fbcf8
1 changed files with 5 additions and 0 deletions
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5
drivers/md/dm.c
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@ -1873,6 +1873,7 @@ EXPORT_SYMBOL_GPL(dm_device_name);
static void __dm_destroy(struct mapped_device *md, bool wait)
{
struct request_queue *q = dm_get_md_queue(md);
struct dm_table *map;
int srcu_idx;
@ -1883,6 +1884,10 @@ 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);
if (dm_request_based(md) && md->kworker_task)
flush_kthread_worker(&md->kworker);