linux-kernel - [PATCH 4.18 067/235] staging: bcm2835-camera: handle wait_for_completion

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Message-Id: <20180924113111.956350723@linuxfoundation.org>
Date:   Mon, 24 Sep 2018 13:50:53 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Nicholas Mc Guire <hofrat@...dl.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 067/235] staging: bcm2835-camera: handle wait_for_completion_timeout return properly

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

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

From: Nicholas Mc Guire <hofrat@...dl.org>

[ Upstream commit 5b70084f6cbcd53f615433f9d216e01bd71de0bb ]

wait_for_completion_timeout returns unsigned long not int so a variable of
proper type is introduced. Further the check for <= 0 is ambiguous and
should be == 0 here indicating timeout.

Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
Fixes: 7b3ad5abf027 ("staging: Import the BCM2835 MMAL-based V4L2 camera driver.")
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
+++ b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
@@ -580,6 +580,7 @@ static int start_streaming(struct vb2_qu
 static void stop_streaming(struct vb2_queue *vq)
 {
 	int ret;
+	unsigned long timeout;
 	struct bm2835_mmal_dev *dev = vb2_get_drv_priv(vq);
 
 	v4l2_dbg(1, bcm2835_v4l2_debug, &dev->v4l2_dev, "%s: dev:%p\n",
@@ -605,10 +606,10 @@ static void stop_streaming(struct vb2_qu
 				      sizeof(dev->capture.frame_count));
 
 	/* wait for last frame to complete */
-	ret = wait_for_completion_timeout(&dev->capture.frame_cmplt, HZ);
-	if (ret <= 0)
+	timeout = wait_for_completion_timeout(&dev->capture.frame_cmplt, HZ);
+	if (timeout == 0)
 		v4l2_err(&dev->v4l2_dev,
-			 "error %d waiting for frame completion\n", ret);
+			 "timed out waiting for frame completion\n");
 
 	v4l2_dbg(1, bcm2835_v4l2_debug, &dev->v4l2_dev,
 		 "disabling connection\n");