From: Florian Echtler <floe@butterbrot.org>
Date: Tue, 31 May 2016 20:15:33 +0000 (-0300)
Subject: sur40: fix occasional oopses on device close
X-Git-Tag: v4.7.2~138
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c84b914813a79e8cf627e67fd50e3d73fecc0ccd;p=thirdparty%2Fkernel%2Fstable.git

sur40: fix occasional oopses on device close

commit 6a8588156657e607fcfdffd46c1daae8ba88a1e5 upstream.

Closing the V4L2 device sometimes triggers a kernel oops.
Present patch fixes this.

Signed-off-by: Martin Kaltenbrunner <modin@yuri.at>
Signed-off-by: Florian Echtler <floe@butterbrot.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/input/touchscreen/sur40.c b/drivers/input/touchscreen/sur40.c
index 9c848ab208314..b7e8c11a6fc2a 100644
--- a/drivers/input/touchscreen/sur40.c
+++ b/drivers/input/touchscreen/sur40.c
@@ -448,7 +448,7 @@ static void sur40_process_video(struct sur40_state *sur40)
 
 	/* return error if streaming was stopped in the meantime */
 	if (sur40->sequence == -1)
-		goto err_poll;
+		return;
 
 	/* mark as finished */
 	new_buf->vb.vb2_buf.timestamp = ktime_get_ns();
@@ -736,6 +736,7 @@ static int sur40_start_streaming(struct vb2_queue *vq, unsigned int count)
 static void sur40_stop_streaming(struct vb2_queue *vq)
 {
 	struct sur40_state *sur40 = vb2_get_drv_priv(vq);
+	vb2_wait_for_all_buffers(vq);
 	sur40->sequence = -1;
 
 	/* Release all active buffers */