4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mike Snitzer <snitzer@xxxxxxxxxx>
commit 937fa62e8a00d0b4bc2c0a40567d7c88ab2b2e8d upstream.
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: 7193a9defc ("dm rq: check kthread_run return for .request_fn request-based DM")
Reported-by: Tahsin Erdogan <tahsin@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/dm-rq.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c
@@ -835,8 +835,11 @@ int dm_old_init_request_queue(struct map
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);
--
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