linux-kernel - [PATCH v4 1/4] media: pxa_camera: fix the buffer free path

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Message-Id: <1440961681-17279-2-git-send-email-robert.jarzmik@free.fr>
Date:	Sun, 30 Aug 2015 21:07:58 +0200
From:	Robert Jarzmik <robert.jarzmik@...e.fr>
To:	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Jiri Kosina <trivial@...nel.org>
Cc:	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	Robert Jarzmik <robert.jarzmik@...el.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>
Subject: [PATCH v4 1/4] media: pxa_camera: fix the buffer free path

From: Robert Jarzmik <robert.jarzmik@...el.com>

Fix the error path where the video buffer wasn't allocated nor
mapped. In this case, in the driver free path don't try to unmap memory
which was not mapped in the first place.

Signed-off-by: Robert Jarzmik <robert.jarzmik@...e.fr>
---
 drivers/media/platform/soc_camera/pxa_camera.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/soc_camera/pxa_camera.c b/drivers/media/platform/soc_camera/pxa_camera.c
index fcb942de0c7f..aa304950bb98 100644
--- a/drivers/media/platform/soc_camera/pxa_camera.c
+++ b/drivers/media/platform/soc_camera/pxa_camera.c
@@ -272,8 +272,8 @@ static void free_buffer(struct videobuf_queue *vq, struct pxa_buffer *buf)
 	 * longer in STATE_QUEUED or STATE_ACTIVE
 	 */
 	videobuf_waiton(vq, &buf->vb, 0, 0);
-	videobuf_dma_unmap(vq->dev, dma);
-	videobuf_dma_free(dma);
+	if (buf->vb.state == VIDEOBUF_NEEDS_INIT)
+		return;
 
 	for (i = 0; i < ARRAY_SIZE(buf->dmas); i++) {
 		if (buf->dmas[i].sg_cpu)
@@ -283,6 +283,8 @@ static void free_buffer(struct videobuf_queue *vq, struct pxa_buffer *buf)
 					  buf->dmas[i].sg_dma);
 		buf->dmas[i].sg_cpu = NULL;
 	}
+	videobuf_dma_unmap(vq->dev, dma);
+	videobuf_dma_free(dma);
 
 	buf->vb.state = VIDEOBUF_NEEDS_INIT;
 }
-- 
2.1.4

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