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kthread_worker: check all delayed works when destroy kthread worker

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When destroying a kthread worker warn if there are still some pending
delayed works.  This indicates that the caller should clear all pending
delayed works before destroying the kthread worker.

Link: https://lkml.kernel.org/r/20230104144230.938521-1-qiang1.zhang@intel.com
Signed-off-by: Zqiang <qiang1.zhang@intel.com>
Acked-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Zqiang 2023-01-04 22:42:30 +08:00 committed by Andrew Morton
parent dd106111db
commit eb79fa7ea7
1 changed files with 5 additions and 0 deletions
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5
kernel/kthread.c
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@ -1382,6 +1382,10 @@ EXPORT_SYMBOL_GPL(kthread_flush_worker);
* Flush and destroy @worker. The simple flush is enough because the kthread
* worker API is used only in trivial scenarios. There are no multi-step state
* machines needed.
*
* Note that this function is not responsible for handling delayed work, so
* caller should be responsible for queuing or canceling all delayed work items
* before invoke this function.
*/
void kthread_destroy_worker(struct kthread_worker *worker)
{
@ -1393,6 +1397,7 @@ void kthread_destroy_worker(struct kthread_worker *worker)
kthread_flush_worker(worker);
kthread_stop(task);
WARN_ON(!list_empty(&worker->delayed_work_list));
WARN_ON(!list_empty(&worker->work_list));
kfree(worker);
}