From: Tejun Heo Date: Mon, 8 Dec 2014 17:39:16 +0000 (-0500) Subject: workqueue: invert the order between pool->lock and wq_mayday_lock X-Git-Url: http://git.efficios.com/?a=commitdiff_plain;h=b2d829096bee7eaf7be31b6229bf722e503adfd8;p=deliverable%2Flinux.git workqueue: invert the order between pool->lock and wq_mayday_lock Currently, pool->lock nests inside pool->lock. There's no inherent reason for this order. The only place where the two locks are held together is pool_mayday_timeout() and it just got decided that way. This nesting order turns out to complicate things with the planned rescuer_thread() update. Let's invert them. This doesn't cause any behavior differences. Signed-off-by: Tejun Heo Reviewed-by: Lai Jiangshan Cc: NeilBrown Cc: Dongsu Park --- diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 5fcd8179e681..3992cf6c3ee3 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -1804,8 +1804,8 @@ static void pool_mayday_timeout(unsigned long __pool) struct worker_pool *pool = (void *)__pool; struct work_struct *work; - spin_lock_irq(&wq_mayday_lock); /* for wq->maydays */ - spin_lock(&pool->lock); + spin_lock_irq(&pool->lock); + spin_lock(&wq_mayday_lock); /* for wq->maydays */ if (need_to_create_worker(pool)) { /* @@ -1818,8 +1818,8 @@ static void pool_mayday_timeout(unsigned long __pool) send_mayday(work); } - spin_unlock(&pool->lock); - spin_unlock_irq(&wq_mayday_lock); + spin_unlock(&wq_mayday_lock); + spin_unlock_irq(&pool->lock); mod_timer(&pool->mayday_timer, jiffies + MAYDAY_INTERVAL); }