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Commit 2f524b48 authored by Linux Build Service Account's avatar Linux Build Service Account Committed by Gerrit - the friendly Code Review server
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Merge "ALSA: timer: Harden slave timer list handling"

parents 18f79ebe d2bab709

sound/core/timer.c

+14 −4
Original line number Diff line number Diff line
@@ -215,11 +215,13 @@ static void snd_timer_check_master(struct snd_timer_instance *master) 
		    slave->slave_id == master->slave_id) {

			list_move_tail(&slave->open_list, &master->slave_list_head);

			spin_lock_irq(&slave_active_lock);

			spin_lock(&master->timer->lock);

			slave->master = master;

			slave->timer = master->timer;

			if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)

				list_add_tail(&slave->active_list,

					      &master->slave_active_head);

			spin_unlock(&master->timer->lock);

			spin_unlock_irq(&slave_active_lock);

		}

	}
@@ -345,15 +347,18 @@ int snd_timer_close(struct snd_timer_instance *timeri) 
		    timer->hw.close)

			timer->hw.close(timer);

		/* remove slave links */

		spin_lock_irq(&slave_active_lock);

		spin_lock(&timer->lock);

		list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,

					 open_list) {

			spin_lock_irq(&slave_active_lock);

			_snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);

			list_move_tail(&slave->open_list, &snd_timer_slave_list);

			slave->master = NULL;

			slave->timer = NULL;

			spin_unlock_irq(&slave_active_lock);

			list_del_init(&slave->ack_list);

			list_del_init(&slave->active_list);

		}

		spin_unlock(&timer->lock);

		spin_unlock_irq(&slave_active_lock);

		mutex_unlock(&register_mutex);

	}

 out:
@@ -440,9 +445,12 @@ static int snd_timer_start_slave(struct snd_timer_instance *timeri) 


	spin_lock_irqsave(&slave_active_lock, flags);

	timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;

	if (timeri->master)

	if (timeri->master && timeri->timer) {

		spin_lock(&timeri->timer->lock);

		list_add_tail(&timeri->active_list,

			      &timeri->master->slave_active_head);

		spin_unlock(&timeri->timer->lock);

	}

	spin_unlock_irqrestore(&slave_active_lock, flags);

	return 1; /* delayed start */

}
@@ -488,6 +496,8 @@ static int _snd_timer_stop(struct snd_timer_instance * timeri, 
		if (!keep_flag) {

			spin_lock_irqsave(&slave_active_lock, flags);

			timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;

			list_del_init(&timeri->ack_list);

			list_del_init(&timeri->active_list);

			spin_unlock_irqrestore(&slave_active_lock, flags);

		}

		goto __end;