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Merge branch 'for-3.14-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

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Pull workqueue fixes from Tejun Heo:
 "Two workqueue fixes.  One for an unlikely but possible critical bug
  during kworker shutdown and the other to make lockdep names a bit more
  descriptive"

* 'for-3.14-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
  workqueue: ensure @task is valid across kthread_stop()
  workqueue: add args to workqueue lockdep name
This commit is contained in:
Linus Torvalds 2014-02-20 12:00:27 -08:00
commit 2b73d207a5
2 changed files with 8 additions and 4 deletions
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5
include/linux/workqueue.h
View file

@ -419,10 +419,7 @@ __alloc_workqueue_key(const char *fmt, unsigned int flags, int max_active,
static struct lock_class_key __key; \
const char *__lock_name; \
\
if (__builtin_constant_p(fmt)) \
__lock_name = (fmt); \
else \
__lock_name = #fmt; \
__lock_name = #fmt#args; \
\
__alloc_workqueue_key((fmt), (flags), (max_active), \
&__key, __lock_name, ##args); \

7
kernel/workqueue.c
View file

@ -1851,6 +1851,12 @@ static void destroy_worker(struct worker *worker)
if (worker->flags & WORKER_IDLE)
pool->nr_idle--;
/*
* Once WORKER_DIE is set, the kworker may destroy itself at any
* point. Pin to ensure the task stays until we're done with it.
*/
get_task_struct(worker->task);
list_del_init(&worker->entry);
worker->flags |= WORKER_DIE;
@ -1859,6 +1865,7 @@ static void destroy_worker(struct worker *worker)
spin_unlock_irq(&pool->lock);
kthread_stop(worker->task);
put_task_struct(worker->task);
kfree(worker);
spin_lock_irq(&pool->lock);