linux-kernel - Re: [PATCH v1 5/5] [media] stm32-dcmi: g_/s

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Date:   Sun, 30 Jul 2017 12:26:55 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Hugues Fruchet <hugues.fruchet@...com>
Cc:     kbuild-all@...org, Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil@...all.nl>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Yannick Fertre <yannick.fertre@...com>,
        Hugues Fruchet <hugues.fruchet@...com>
Subject: Re: [PATCH v1 5/5] [media] stm32-dcmi: g_/s_selection crop support

Hi Hugues,

[auto build test WARNING on linuxtv-media/master]
[also build test WARNING on v4.13-rc2 next-20170728]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Hugues-Fruchet/STM32-DCMI-camera-interface-crop-support/20170730-114803
base:   git://linuxtv.org/media_tree.git master
config: powerpc-allmodconfig (attached as .config)
compiler: powerpc64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=powerpc 

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

   drivers/media//platform/stm32/stm32-dcmi.c: In function 'dcmi_graph_notify_complete':
>> drivers/media//platform/stm32/stm32-dcmi.c:1445:5: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized]
     if (ret) {
        ^

vim +/ret +1445 drivers/media//platform/stm32/stm32-dcmi.c

  1431	
  1432	static int dcmi_graph_notify_complete(struct v4l2_async_notifier *notifier)
  1433	{
  1434		struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
  1435		int ret;
  1436	
  1437		dcmi->vdev->ctrl_handler = dcmi->entity.subdev->ctrl_handler;
  1438		ret = dcmi_formats_init(dcmi);
  1439		if (ret) {
  1440			dev_err(dcmi->dev, "No supported mediabus format found\n");
  1441			return ret;
  1442		}
  1443	
  1444		ret = dcmi_framesizes_init(dcmi);
> 1445		if (ret) {
  1446			dev_err(dcmi->dev, "Could not initialize framesizes\n");
  1447			return ret;
  1448		}
  1449	
  1450		ret = dcmi_get_sensor_bounds(dcmi, &dcmi->sd_bounds);
  1451		if (ret) {
  1452			dev_err(dcmi->dev, "Could not get sensor bounds\n");
  1453			return ret;
  1454		}
  1455	
  1456		ret = dcmi_set_default_fmt(dcmi);
  1457		if (ret) {
  1458			dev_err(dcmi->dev, "Could not set default format\n");
  1459			return ret;
  1460		}
  1461	
  1462		ret = video_register_device(dcmi->vdev, VFL_TYPE_GRABBER, -1);
  1463		if (ret) {
  1464			dev_err(dcmi->dev, "Failed to register video device\n");
  1465			return ret;
  1466		}
  1467	
  1468		dev_dbg(dcmi->dev, "Device registered as %s\n",
  1469			video_device_node_name(dcmi->vdev));
  1470		return 0;
  1471	}
  1472	

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