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

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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")
Cc: stable@vger.kernel.org # 4.8
Reported-by: Tahsin Erdogan <tahsin@google.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2016-10-18 14:02:04 -04:00
parent d09960b003
commit 937fa62e8a
1 changed files with 5 additions and 2 deletions
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7
drivers/md/dm-rq.c
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@ -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);