linux-kernel - [PATCH] [STABLE-4.13] [media] imx-media-of: avoid uninitialized variable warning

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Message-Id: <20171004133507.3539072-1-arnd@arndb.de>
Date:   Wed,  4 Oct 2017 15:34:55 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>, stable@...r.kernel.org,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Steve Longerbeam <steve_longerbeam@...tor.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Mauro Carvalho Chehab <mchehab@...pensource.com>,
        Steve Longerbeam <slongerbeam@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Russell King <rmk+kernel@...linux.org.uk>,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] [STABLE-4.13] [media] imx-media-of: avoid uninitialized variable warning

Replaces upstream commit 0b2e9e7947e7 ("media: staging/imx: remove
confusing IS_ERR_OR_NULL usage")

We get a harmless warning about a potential uninitialized variable
use in the driver:

drivers/staging/media/imx/imx-media-of.c: In function 'of_parse_subdev':
drivers/staging/media/imx/imx-media-of.c:216:4: warning: 'remote_np' may be used uninitialized in this function [-Wmaybe-uninitialized]

I reworked that code to be easier to understand by gcc in mainline,
but that commit is too large to backport. This is a much simpler
workaround, avoiding the warning by adding a fake initialization
to the variable. The driver was only introduced in linux-4.13,
so the workaround is not needed for earlier stable kernels.

Fixes: e130291212df ("[media] media: Add i.MX media core driver")
Cc: stable@...r.kernel.org
Cc: Philipp Zabel <p.zabel@...gutronix.de>
Cc: Steve Longerbeam <steve_longerbeam@...tor.com>
Cc: Hans Verkuil <hans.verkuil@...co.com>
Cc: Mauro Carvalho Chehab <mchehab@...pensource.com>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/staging/media/imx/imx-media-of.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/media/imx/imx-media-of.c b/drivers/staging/media/imx/imx-media-of.c
index b026fe66467c..90e7e702a411 100644
--- a/drivers/staging/media/imx/imx-media-of.c
+++ b/drivers/staging/media/imx/imx-media-of.c
@@ -167,7 +167,7 @@ of_parse_subdev(struct imx_media_dev *imxmd, struct device_node *sd_np,
 		of_parse_sensor(imxmd, imxsd, sd_np);
 
 	for (i = 0; i < num_pads; i++) {
-		struct device_node *epnode = NULL, *port, *remote_np;
+		struct device_node *epnode = NULL, *port, *remote_np = NULL;
 		struct imx_media_subdev *remote_imxsd;
 		struct imx_media_pad *pad;
 		int remote_pad;
-- 
2.9.0