dm rq: check kthread_run return for .request_fn request-based DM

Check return value of kthread_run() in dm_old_init_request_queue().

Reported-by: Minfei Huang <mnghuan@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c
index 266f7b6..aa81539 100644 (file)
--- a/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c
@@ -819,6 +819,8 @@ 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);
 
        elv_register_queue(md->queue);