Commit 937fa62e authored Oct 18, 2016 by Mike Snitzer

dm rq: clear kworker_task if kthread_run() returned an error



cleanup_mapped_device() calls kthread_stop() if kworker_task is
non-NULL.  Currently the assigned value could be a valid task struct or
an error code (e.g -ENOMEM).  Reset md->kworker_task to NULL if
kthread_run() returned an erorr.

Fixes: 7193a9de ("dm rq: check kthread_run return for .request_fn request-based DM")
Cc: stable@vger.kernel.org # 4.8
Reported-by: Tahsin Erdogan <tahsin@google.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

parent d09960b0

drivers/md/dm-rq.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -856,8 +856,11 @@ int dm_old_init_request_queue(struct mapped_device *md)
		init_kthread_worker(&md->kworker);
		md->kworker_task = kthread_run(kthread_worker_fn, &md->kworker,
		"kdmwork-%s", dm_device_name(md));
		if (IS_ERR(md->kworker_task))
		return PTR_ERR(md->kworker_task);
		if (IS_ERR(md->kworker_task)) {
		int error = PTR_ERR(md->kworker_task);
		md->kworker_task = NULL;
		return error;
		}

		elv_register_queue(md->queue);