diff options
| author | Tejun Heo <tj@kernel.org> | 2010-07-14 11:31:20 +0200 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2010-07-14 11:31:20 +0200 |
| commit | 9f9c23644b07e7a51f6f39064e61c150be712932 (patch) | |
| tree | 831849ae8bfd602b3333e8ea8e3beb2cf0dee348 /kernel/workqueue.c | |
| parent | 083b804c4d3e1e3d0eace56bdbc0f674946d2847 (diff) | |
| download | lwn-9f9c23644b07e7a51f6f39064e61c150be712932.tar.gz lwn-9f9c23644b07e7a51f6f39064e61c150be712932.zip | |
workqueue: fix locking in retry path of maybe_create_worker()
maybe_create_worker() mismanaged locking when worker creation fails
and it has to retry. Fix locking and simplify lock manipulation.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Yong Zhang <yong.zhang@windriver.com>
Diffstat (limited to 'kernel/workqueue.c')
| -rw-r--r-- | kernel/workqueue.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 20d6237d7498..aca94726e20a 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -1442,14 +1442,14 @@ static bool maybe_create_worker(struct global_cwq *gcwq) if (!need_to_create_worker(gcwq)) return false; restart: + spin_unlock_irq(&gcwq->lock); + /* if we don't make progress in MAYDAY_INITIAL_TIMEOUT, call for help */ mod_timer(&gcwq->mayday_timer, jiffies + MAYDAY_INITIAL_TIMEOUT); while (true) { struct worker *worker; - spin_unlock_irq(&gcwq->lock); - worker = create_worker(gcwq, true); if (worker) { del_timer_sync(&gcwq->mayday_timer); @@ -1462,15 +1462,13 @@ restart: if (!need_to_create_worker(gcwq)) break; - spin_unlock_irq(&gcwq->lock); __set_current_state(TASK_INTERRUPTIBLE); schedule_timeout(CREATE_COOLDOWN); - spin_lock_irq(&gcwq->lock); + if (!need_to_create_worker(gcwq)) break; } - spin_unlock_irq(&gcwq->lock); del_timer_sync(&gcwq->mayday_timer); spin_lock_irq(&gcwq->lock); if (need_to_create_worker(gcwq)) |