4.8-stable review patch. If anyone has any objections, please let me know.
------------------ From: Bart Van Assche <[email protected]> commit 3b785fbcf81c3533772c52b717f77293099498d3 upstream. This avoids that new requests are queued while __dm_destroy() is in progress. Signed-off-by: Bart Van Assche <[email protected]> Signed-off-by: Mike Snitzer <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/md/dm.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -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_d 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);
