linux-kernel - Re: [PATCH] drm/of: Fix device node reference leak in drm_of_panel_bridge

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Message-ID: <202510282155.MdnvC7YI-lkp@intel.com>
Date: Tue, 28 Oct 2025 22:22:08 +0800
From: kernel test robot <lkp@...el.com>
To: Miaoqian Lin <linmq006@...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>,
	"benjamin.gaignard@...aro.org" <benjamin.gaignard@...aro.org>,
	Philippe Cornu <philippe.cornu@...com>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, linmq006@...il.com,
	stable@...r.kernel.org
Subject: Re: [PATCH] drm/of: Fix device node reference leak in
 drm_of_panel_bridge_remove

Hi Miaoqian,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on linus/master v6.18-rc3 next-20251028]
[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/Miaoqian-Lin/drm-of-Fix-device-node-reference-leak-in-drm_of_panel_bridge_remove/20251028-141134
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20251028060918.65688-1-linmq006%40gmail.com
patch subject: [PATCH] drm/of: Fix device node reference leak in drm_of_panel_bridge_remove
config: x86_64-randconfig-161-20251028 (https://download.01.org/0day-ci/archive/20251028/202510282155.MdnvC7YI-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251028/202510282155.MdnvC7YI-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/202510282155.MdnvC7YI-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/gpu/drm/tiny/arcpgu.c:23:
   include/drm/drm_of.h: In function 'drm_of_panel_bridge_remove':
   include/drm/drm_of.h:174:9: error: implicit declaration of function 'of_node_put' [-Wimplicit-function-declaration]
     174 |         of_node_put(remote);
         |         ^~~~~~~~~~~
   In file included from include/linux/of_reserved_mem.h:6,
                    from drivers/gpu/drm/tiny/arcpgu.c:28:
   include/linux/of.h: At top level:
>> include/linux/of.h:129:13: warning: conflicting types for 'of_node_put'; have 'void(struct device_node *)'
     129 | extern void of_node_put(struct device_node *node);
         |             ^~~~~~~~~~~
   include/drm/drm_of.h:174:9: note: previous implicit declaration of 'of_node_put' with type 'void(struct device_node *)'
     174 |         of_node_put(remote);
         |         ^~~~~~~~~~~


vim +129 include/linux/of.h

0829f6d1f69e4f Pantelis Antoniou 2013-12-13  126  
0f22dd395fc473 Grant Likely      2012-02-15  127  #ifdef CONFIG_OF_DYNAMIC
0f22dd395fc473 Grant Likely      2012-02-15  128  extern struct device_node *of_node_get(struct device_node *node);
0f22dd395fc473 Grant Likely      2012-02-15 @129  extern void of_node_put(struct device_node *node);
0f22dd395fc473 Grant Likely      2012-02-15  130  #else /* CONFIG_OF_DYNAMIC */
3ecdd0515287af Rob Herring       2011-12-13  131  /* Dummy ref counting routines - to be implemented later */
3ecdd0515287af Rob Herring       2011-12-13  132  static inline struct device_node *of_node_get(struct device_node *node)
3ecdd0515287af Rob Herring       2011-12-13  133  {
3ecdd0515287af Rob Herring       2011-12-13  134  	return node;
3ecdd0515287af Rob Herring       2011-12-13  135  }
0f22dd395fc473 Grant Likely      2012-02-15  136  static inline void of_node_put(struct device_node *node) { }
0f22dd395fc473 Grant Likely      2012-02-15  137  #endif /* !CONFIG_OF_DYNAMIC */
9448e55d032d99 Jonathan Cameron  2024-02-25  138  DEFINE_FREE(device_node, struct device_node *, if (_T) of_node_put(_T))
3ecdd0515287af Rob Herring       2011-12-13  139  

-- 
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https://github.com/intel/lkp-tests/wiki