From 87fc741e94cf64445c698486982b30afa0811eca Mon Sep 17 00:00:00 2001 From: Lai Jiangshan Date: Mon, 25 Mar 2013 16:57:18 -0700 Subject: [PATCH] workqueue: protect wq->nr_drainers and ->flags with wq->mutex We're expanding wq->mutex to cover all fields specific to each workqueue with the end goal of replacing pwq_lock which will make locking simpler and easier to understand. wq->nr_drainers and ->flags are specific to each workqueue. Protect ->nr_drainers and ->flags with wq->mutex instead of pool_mutex. tj: Rebased on top of the current dev branch. Updated description. Signed-off-by: Lai Jiangshan Signed-off-by: Tejun Heo --- kernel/workqueue.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/kernel/workqueue.c b/kernel/workqueue.c index d448edae3513..3ac2c4d85607 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -226,7 +226,7 @@ struct wq_device; * the appropriate worker_pool through its pool_workqueues. */ struct workqueue_struct { - unsigned int flags; /* PL: WQ_* flags */ + unsigned int flags; /* WQ: WQ_* flags */ struct pool_workqueue __percpu *cpu_pwqs; /* I: per-cpu pwq's */ struct list_head pwqs; /* WR: all pwqs of this wq */ struct list_head list; /* PL: list of all workqueues */ @@ -242,7 +242,7 @@ struct workqueue_struct { struct list_head maydays; /* MD: pwqs requesting rescue */ struct worker *rescuer; /* I: rescue worker */ - int nr_drainers; /* PL: drain in progress */ + int nr_drainers; /* WQ: drain in progress */ int saved_max_active; /* PW: saved pwq max_active */ #ifdef CONFIG_SYSFS @@ -2684,10 +2684,10 @@ void drain_workqueue(struct workqueue_struct *wq) * hotter than drain_workqueue() and already looks at @wq->flags. * Use __WQ_DRAINING so that queue doesn't have to check nr_drainers. */ - mutex_lock(&wq_pool_mutex); + mutex_lock(&wq->mutex); if (!wq->nr_drainers++) wq->flags |= __WQ_DRAINING; - mutex_unlock(&wq_pool_mutex); + mutex_unlock(&wq->mutex); reflush: flush_workqueue(wq); @@ -2714,10 +2714,10 @@ reflush: local_irq_enable(); - mutex_lock(&wq_pool_mutex); + mutex_lock(&wq->mutex); if (!--wq->nr_drainers) wq->flags &= ~__WQ_DRAINING; - mutex_unlock(&wq_pool_mutex); + mutex_unlock(&wq->mutex); } EXPORT_SYMBOL_GPL(drain_workqueue);