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| author | Grant Likely <grant.likely@secretlab.ca> | 2011-02-12 23:53:34 -0700 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2011-02-12 23:53:34 -0700 |
| commit | c170093d31bd4e3bc51881cc0f123beeca7872c9 (patch) | |
| tree | d93cd280d525dd339f33be010c75b7fd0bacd690 /kernel/workqueue.c | |
| parent | 557218e2d662574bc58d840fe116c7fd8d57aed8 (diff) | |
| parent | 78bba987bc025a7263248501b453476e77b93331 (diff) | |
| download | linux-next-c170093d31bd4e3bc51881cc0f123beeca7872c9.tar.gz | |
Merge branch 'devicetree/merge' into spi/merge
Diffstat (limited to 'kernel/workqueue.c')
| -rw-r--r-- | kernel/workqueue.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 8ee6ec82f88a..11869faa6819 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -768,7 +768,11 @@ static inline void worker_clr_flags(struct worker *worker, unsigned int flags) worker->flags &= ~flags; - /* if transitioning out of NOT_RUNNING, increment nr_running */ + /* + * If transitioning out of NOT_RUNNING, increment nr_running. Note + * that the nested NOT_RUNNING is not a noop. NOT_RUNNING is mask + * of multiple flags, not a single flag. + */ if ((flags & WORKER_NOT_RUNNING) && (oflags & WORKER_NOT_RUNNING)) if (!(worker->flags & WORKER_NOT_RUNNING)) atomic_inc(get_gcwq_nr_running(gcwq->cpu)); @@ -1840,7 +1844,7 @@ __acquires(&gcwq->lock) spin_unlock_irq(&gcwq->lock); work_clear_pending(work); - lock_map_acquire(&cwq->wq->lockdep_map); + lock_map_acquire_read(&cwq->wq->lockdep_map); lock_map_acquire(&lockdep_map); trace_workqueue_execute_start(work); f(work); @@ -2384,8 +2388,18 @@ static bool start_flush_work(struct work_struct *work, struct wq_barrier *barr, insert_wq_barrier(cwq, barr, work, worker); spin_unlock_irq(&gcwq->lock); - lock_map_acquire(&cwq->wq->lockdep_map); + /* + * If @max_active is 1 or rescuer is in use, flushing another work + * item on the same workqueue may lead to deadlock. Make sure the + * flusher is not running on the same workqueue by verifying write + * access. + */ + if (cwq->wq->saved_max_active == 1 || cwq->wq->flags & WQ_RESCUER) + lock_map_acquire(&cwq->wq->lockdep_map); + else + lock_map_acquire_read(&cwq->wq->lockdep_map); lock_map_release(&cwq->wq->lockdep_map); + return true; already_gone: spin_unlock_irq(&gcwq->lock); |