linux-kernel - [PATCH AUTOSEL 4.18 57/88] staging: bcm2835-camera: fix timeout handling in wait_for_completion

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Message-ID: <20180907003547.57567-57-alexander.levin@microsoft.com>
Date:   Fri, 7 Sep 2018 00:36:33 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Nicholas Mc Guire <hofrat@...dl.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.18 57/88] staging: bcm2835-camera: fix timeout
 handling in wait_for_completion_timeout

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

[ Upstream commit b7afce51d95726a619743aaad8870db66dfa1479 ]

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 which is the only error case so no additional
check needed here.

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>
---
 .../staging/vc04_services/bcm2835-camera/mmal-vchiq.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c b/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c
index f5b5ead6347c..51e5b04ff0f5 100644
--- a/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c
+++ b/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c
@@ -630,6 +630,7 @@ static int send_synchronous_mmal_msg(struct vchiq_mmal_instance *instance,
 {
 	struct mmal_msg_context *msg_context;
 	int ret;
+	unsigned long timeout;
 
 	/* payload size must not cause message to exceed max size */
 	if (payload_len >
@@ -668,11 +669,11 @@ static int send_synchronous_mmal_msg(struct vchiq_mmal_instance *instance,
 		return ret;
 	}
 
-	ret = wait_for_completion_timeout(&msg_context->u.sync.cmplt, 3 * HZ);
-	if (ret <= 0) {
-		pr_err("error %d waiting for sync completion\n", ret);
-		if (ret == 0)
-			ret = -ETIME;
+	timeout = wait_for_completion_timeout(&msg_context->u.sync.cmplt,
+					      3 * HZ);
+	if (timeout == 0) {
+		pr_err("timed out waiting for sync completion\n");
+		ret = -ETIME;
 		/* todo: what happens if the message arrives after aborting */
 		release_msg_context(msg_context);
 		return ret;
-- 
2.17.1