linux-kernel - Re: [PATCH] drm/bridge: adv7511: Fix Intermittent EDID failures

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Date: Wed, 22 May 2024 05:12:07 +0800
From: kernel test robot <lkp@...el.com>
To: Adam Ford <aford173@...il.com>, dri-devel@...ts.freedesktop.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	dmitry.baryshkov@...aro.org, ictor.liu@....com,
	sui.jingfeng@...ux.dev, aford@...conembedded.com,
	Adam Ford <aford173@...il.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>, Daniel Vetter <daniel@...ll.ch>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: adv7511:  Fix Intermittent EDID failures

Hi Adam,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on drm/drm-next drm-exynos/exynos-drm-next drm-intel/for-linux-next drm-tip/drm-tip linus/master drm-intel/for-linux-next-fixes v6.9 next-20240521]
[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/Adam-Ford/drm-bridge-adv7511-Fix-Intermittent-EDID-failures/20240521-091841
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20240521011614.496421-1-aford173%40gmail.com
patch subject: [PATCH] drm/bridge: adv7511:  Fix Intermittent EDID failures
config: i386-buildonly-randconfig-002-20240521 (https://download.01.org/0day-ci/archive/20240522/202405220445.DW2U7DXR-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240522/202405220445.DW2U7DXR-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/202405220445.DW2U7DXR-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/bridge/adv7511/adv7511_drv.c:507:35: warning: variable 'cec_status' is uninitialized when used here [-Wuninitialized]
     507 |         if (irq_status == IRQ_HANDLED || cec_status == IRQ_HANDLED)
         |                                          ^~~~~~~~~~
   drivers/gpu/drm/bridge/adv7511/adv7511_drv.c:472:16: note: initialize the variable 'cec_status' to silence this warning
     472 |         int cec_status;
         |                       ^
         |                        = 0
   1 warning generated.


vim +/cec_status +507 drivers/gpu/drm/bridge/adv7511/adv7511_drv.c

   505	
   506		/* If there is no IRQ to handle, exit indicating no IRQ data */
 > 507		if (irq_status == IRQ_HANDLED || cec_status == IRQ_HANDLED)
   508			return IRQ_HANDLED;
   509	
   510		return IRQ_NONE;
   511	}
   512	

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