linux-kernel - Re: [PATCH v2 1/4] drm/bridge: imx8qxp-pxl2dpi: Use dev_err

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Message-ID: <202501081822.A69smnpW-lkp@intel.com>
Date: Wed, 8 Jan 2025 19:06:44 +0800
From: kernel test robot <lkp@...el.com>
To: Alexander Stein <alexander.stein@...tq-group.com>,
	Liu Ying <victor.liu@....com>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Alexander Stein <alexander.stein@...tq-group.com>,
	dri-devel@...ts.freedesktop.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] drm/bridge: imx8qxp-pxl2dpi: Use dev_err_probe

Hi Alexander,

kernel test robot noticed the following build warnings:

[auto build test WARNING on shawnguo/for-next]
[also build test WARNING on linus/master v6.13-rc6 next-20250107]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Alexander-Stein/drm-bridge-imx8qxp-pxl2dpi-Use-dev_err_probe/20250107-224125
base:   https://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux.git for-next
patch link:    https://lore.kernel.org/r/20250107143900.988567-2-alexander.stein%40ew.tq-group.com
patch subject: [PATCH v2 1/4] drm/bridge: imx8qxp-pxl2dpi: Use dev_err_probe
config: arm-randconfig-004-20250108 (https://download.01.org/0day-ci/archive/20250108/202501081822.A69smnpW-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250108/202501081822.A69smnpW-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202501081822.A69smnpW-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:402:29: warning: variable 'ret' is uninitialized when used here [-Wuninitialized]
     402 |                 return dev_err_probe(dev, ret, "failed to get regmap\n");
         |                                           ^~~
   drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:394:9: note: initialize the variable 'ret' to silence this warning
     394 |         int ret;
         |                ^
         |                 = 0
   1 warning generated.


vim +/ret +402 drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c

   388	
   389	static int imx8qxp_pxl2dpi_bridge_probe(struct platform_device *pdev)
   390	{
   391		struct imx8qxp_pxl2dpi *p2d;
   392		struct device *dev = &pdev->dev;
   393		struct device_node *np = dev->of_node;
   394		int ret;
   395	
   396		p2d = devm_kzalloc(dev, sizeof(*p2d), GFP_KERNEL);
   397		if (!p2d)
   398			return -ENOMEM;
   399	
   400		p2d->regmap = syscon_node_to_regmap(np->parent);
   401		if (IS_ERR(p2d->regmap))
 > 402			return dev_err_probe(dev, ret, "failed to get regmap\n");
   403	
   404		ret = imx_scu_get_handle(&p2d->ipc_handle);
   405		if (ret)
   406			return dev_err_probe(dev, ret, "failed to get SCU ipc handle\n");
   407	
   408		p2d->dev = dev;
   409	
   410		ret = of_property_read_u32(np, "fsl,sc-resource", &p2d->sc_resource);
   411		if (ret) {
   412			DRM_DEV_ERROR(dev, "failed to get SC resource %d\n", ret);
   413			return ret;
   414		}
   415	
   416		p2d->next_bridge = imx8qxp_pxl2dpi_find_next_bridge(p2d);
   417		if (IS_ERR(p2d->next_bridge))
   418			return dev_err_probe(dev, PTR_ERR(p2d->next_bridge),
   419					     "failed to find next bridge\n");
   420	
   421		ret = imx8qxp_pxl2dpi_set_pixel_link_sel(p2d);
   422		if (ret)
   423			return ret;
   424	
   425		ret = imx8qxp_pxl2dpi_parse_dt_companion(p2d);
   426		if (ret)
   427			return ret;
   428	
   429		platform_set_drvdata(pdev, p2d);
   430		pm_runtime_enable(dev);
   431	
   432		p2d->bridge.driver_private = p2d;
   433		p2d->bridge.funcs = &imx8qxp_pxl2dpi_bridge_funcs;
   434		p2d->bridge.of_node = np;
   435	
   436		drm_bridge_add(&p2d->bridge);
   437	
   438		return ret;
   439	}
   440	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki