linux-kernel - [PATCH 4.8 131/138] [media] v4l: vsp1: Prevent pipelines from running when not streaming

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Message-Id: <20161109102850.990308725@linuxfoundation.org>
Date:   Wed,  9 Nov 2016 11:46:54 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kieran Bingham <kieran@...uared.org.uk>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...pensource.com>
Subject: [PATCH 4.8 131/138] [media] v4l: vsp1: Prevent pipelines from running when not streaming

4.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>

commit e4e70a147a48618a36ae1b81c641516cb9d45993 upstream.

Pipelines can only be run if all their video nodes are streaming. Commit
b4dfb9b35a19 ("[media] v4l: vsp1: Stop the pipeline upon the first
STREAMOFF") fixed the pipeline stop sequence, but introduced a race
condition that makes it possible to run a pipeline after stopping the
stream on a video node by queuing a buffer on the other side of the
pipeline.

Fix this by clearing the buffers ready flag when stopping the stream,
which will prevent the QBUF handler from running the pipeline.

Fixes: b4dfb9b35a19 ("[media] v4l: vsp1: Stop the pipeline upon the first STREAMOFF")

Reported-by: Kieran Bingham <kieran@...gham.xyz>
Tested-by: Kieran Bingham <kieran@...gham.xyz>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...pensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/media/platform/vsp1/vsp1_video.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/media/platform/vsp1/vsp1_video.c
+++ b/drivers/media/platform/vsp1/vsp1_video.c
@@ -675,6 +675,13 @@ static void vsp1_video_stop_streaming(st
 	unsigned long flags;
 	int ret;
 
+	/* Clear the buffers ready flag to make sure the device won't be started
+	 * by a QBUF on the video node on the other side of the pipeline.
+	 */
+	spin_lock_irqsave(&video->irqlock, flags);
+	pipe->buffers_ready &= ~(1 << video->pipe_index);
+	spin_unlock_irqrestore(&video->irqlock, flags);
+
 	mutex_lock(&pipe->lock);
 	if (--pipe->stream_count == pipe->num_inputs) {
 		/* Stop the pipeline. */