[PATCH v10 06/11] kthread: Add kthread_destroy_worker()
From: Petr Mladek <pmladek@suse.com>
Date: 2016-08-09 14:58:05
Also in:
linux-mm, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
The current kthread worker users call flush() and stop() explicitly. This function does the same plus it frees the kthread_worker struct in one call. It is supposed to be used together with kthread_create_worker*() that allocates struct kthread_worker. Signed-off-by: Petr Mladek <pmladek@suse.com> --- include/linux/kthread.h | 2 ++ kernel/kthread.c | 23 +++++++++++++++++++++++ 2 files changed, 25 insertions(+)
diff --git a/include/linux/kthread.h b/include/linux/kthread.h
index daeb2befbabf..afc8939da861 100644
--- a/include/linux/kthread.h
+++ b/include/linux/kthread.h@@ -136,4 +136,6 @@ bool kthread_queue_work(struct kthread_worker *worker, void kthread_flush_work(struct kthread_work *work); void kthread_flush_worker(struct kthread_worker *worker); +void kthread_destroy_worker(struct kthread_worker *worker); + #endif /* _LINUX_KTHREAD_H */
diff --git a/kernel/kthread.c b/kernel/kthread.c
index d9ba5e229cd3..3dc7f26d84d7 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c@@ -819,3 +819,26 @@ void kthread_flush_worker(struct kthread_worker *worker) wait_for_completion(&fwork.done); } EXPORT_SYMBOL_GPL(kthread_flush_worker); + +/** + * kthread_destroy_worker - destroy a kthread worker + * @worker: worker to be destroyed + * + * 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. + */ +void kthread_destroy_worker(struct kthread_worker *worker) +{ + struct task_struct *task; + + task = worker->task; + if (WARN_ON(!task)) + return; + + kthread_flush_worker(worker); + kthread_stop(task); + WARN_ON(!list_empty(&worker->work_list)); + kfree(worker); +} +EXPORT_SYMBOL(kthread_destroy_worker);
--
1.8.5.6
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