On Tue, Apr 21, 2020 at 10:48:45AM +0800, Hillf Danton wrote: > > On Mon, 20 Apr 2020 18:39:29 -0400 Dan Schatzberg wrote: > > > > @@ -1140,8 +1215,17 @@ static int __loop_clr_fd(struct loop_device *lo, bool release) > > blk_mq_freeze_queue(lo->lo_queue); > > > > spin_lock_irq(&lo->lo_lock); > > + destroy_workqueue(lo->workqueue); > > Destruct it out of atomic context. I may as well do this, but it doesn't matter, does it? The blk_mq_freeze_queue above should drain all I/O so the workqueue will be idle.
