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[media] v4l: vsp1: Fix race condition when stopping pipeline

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When stopping the pipeline the driver waits for the pipeline state to be
set to VSP1_PIPELINE_STOPPED but fails to lock the pipe irqlock to read
the state variable protected by the lock. Fix it.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Laurent Pinchart 2015-04-29 16:54:39 -03:00 committed by Mauro Carvalho Chehab
parent 139c92866e
commit 1c991fee30
1 changed files with 14 additions and 3 deletions
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17
drivers/media/platform/vsp1/vsp1_video.c
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@ -514,6 +514,18 @@ static void vsp1_pipeline_run(struct vsp1_pipeline *pipe)
pipe->buffers_ready = 0;
}
bool vsp1_pipeline_stopped(struct vsp1_pipeline *pipe)
{
unsigned long flags;
bool stopped;
spin_lock_irqsave(&pipe->irqlock, flags);
stopped = pipe->state == VSP1_PIPELINE_STOPPED,
spin_unlock_irqrestore(&pipe->irqlock, flags);
return stopped;
}
static int vsp1_pipeline_stop(struct vsp1_pipeline *pipe)
{
struct vsp1_entity *entity;
@ -525,7 +537,7 @@ static int vsp1_pipeline_stop(struct vsp1_pipeline *pipe)
pipe->state = VSP1_PIPELINE_STOPPING;
spin_unlock_irqrestore(&pipe->irqlock, flags);
ret = wait_event_timeout(pipe->wq, pipe->state == VSP1_PIPELINE_STOPPED,
ret = wait_event_timeout(pipe->wq, vsp1_pipeline_stopped(pipe),
msecs_to_jiffies(500));
ret = ret == 0 ? -ETIMEDOUT : 0;
@ -741,8 +753,7 @@ void vsp1_pipelines_suspend(struct vsp1_device *vsp1)
if (pipe == NULL)
continue;
ret = wait_event_timeout(pipe->wq,
pipe->state == VSP1_PIPELINE_STOPPED,
ret = wait_event_timeout(pipe->wq, vsp1_pipeline_stopped(pipe),
msecs_to_jiffies(500));
if (ret == 0)
dev_warn(vsp1->dev, "pipeline %u stop timeout\n",