[PATCH v4 06/22] kthread: Add destroy_kthread_worker()
From: Petr Mladek <pmladek@suse.com>
Date: 2016-01-25 15:47:59
Also in:
linux-mm, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
The current kthread worker users call flush() and stop() explicitly. This function drains the worker, stops it, and frees the kthread_worker struct in one call. It is supposed to be used together with create_kthread_worker*() that allocates struct kthread_worker. Also note that drain() correctly handles self-queuing works in compare with flush(). Signed-off-by: Petr Mladek <pmladek@suse.com> --- include/linux/kthread.h | 2 ++ kernel/kthread.c | 21 +++++++++++++++++++++ 2 files changed, 23 insertions(+)
diff --git a/include/linux/kthread.h b/include/linux/kthread.h
index 943900c7ce35..c4a95a3ba500 100644
--- a/include/linux/kthread.h
+++ b/include/linux/kthread.h@@ -136,4 +136,6 @@ bool queue_kthread_work(struct kthread_worker *worker, void flush_kthread_work(struct kthread_work *work); void flush_kthread_worker(struct kthread_worker *worker); +void destroy_kthread_worker(struct kthread_worker *worker); + #endif /* _LINUX_KTHREAD_H */
diff --git a/kernel/kthread.c b/kernel/kthread.c
index a18ad3b58f61..1d41e0faef2d 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c@@ -838,3 +838,24 @@ void drain_kthread_worker(struct kthread_worker *worker) spin_unlock_irq(&worker->lock); } EXPORT_SYMBOL(drain_kthread_worker); + +/** + * destroy_kthread_worker - destroy a kthread worker + * @worker: worker to be destroyed + * + * Drain and destroy @worker. It has the same conditions + * for use as drain_kthread_worker(), see above. + */ +void destroy_kthread_worker(struct kthread_worker *worker) +{ + struct task_struct *task; + + task = worker->task; + if (WARN_ON(!task)) + return; + + drain_kthread_worker(worker); + kthread_stop(task); + kfree(worker); +} +EXPORT_SYMBOL(destroy_kthread_worker);
--
1.8.5.6
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