Re: [kbuild-all] Re: [PATCH v2 2/2] drm: automatic legacy gamma support

From: Philip Li <philip.li@intel.com>
To: "Ville Syrjälä" <ville.syrjala@linux.intel.com>,
	"Dan Carpenter" <dan.carpenter@oracle.com>
Cc: Paul Cercueil <paul@crapouillou.net>,
	kbuild-all@lists.01.org, kernel test robot <lkp@intel.com>,
	Sandy Huang <hjc@rock-chips.com>, David Airlie <airlied@linux.ie>,
	Philippe Cornu <philippe.cornu@st.com>,
	dri-devel@lists.freedesktop.org,
	Russell King <linux@armlinux.org.uk>,
	Yannick Fertre <yannick.fertre@st.com>,
	Tomi Valkeinen <tomi.valkeinen@ti.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Subject: Re: [kbuild-all] Re: [PATCH v2 2/2] drm: automatic legacy gamma support
Date: Sat, 12 Dec 2020 16:54:45 +0800	[thread overview]
Message-ID: <20201212085445.GC31899@intel.com> (raw)
In-Reply-To: <X9OFODh+xRWrFTcf@intel.com>

On Fri, Dec 11, 2020 at 04:42:00PM +0200, Ville Syrjälä wrote:
> On Fri, Dec 11, 2020 at 01:24:49PM +0200, Tomi Valkeinen wrote:
> > On 10/12/2020 20:06, kernel test robot wrote:
> > > Hi Tomi,
> > > 
> > > I love your patch! Perhaps something to improve:
> > > 
> > > [auto build test WARNING on drm-intel/for-linux-next]
> > > [also build test WARNING on linus/master v5.10-rc7]
> > > [cannot apply to drm-tip/drm-tip anholt/for-next next-20201210]
> > > [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]
> > > 
> > > url:    https://github.com/0day-ci/linux/commits/Tomi-Valkeinen/drm-fix-and-cleanup-legacy-gamma-support/20201208-215917
> > > base:   git://anongit.freedesktop.org/drm-intel for-linux-next
> > > config: i386-randconfig-m021-20201209 (attached as .config)
> > > compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
> > > 
> > > If you fix the issue, kindly add following tag as appropriate
> > > Reported-by: kernel test robot <lkp@intel.com>
> > > 
> > > New smatch warnings:
> > > drivers/gpu/drm/drm_color_mgmt.c:307 drm_crtc_legacy_gamma_set() error: potential null dereference 'blob'.  (drm_property_create_blob returns null)
> > 
> > I don't see how this could happen. There's no code path I see where drm_property_create_blob could
> > return null...
> 
> IIRC we've received multiple similar nonsense reports from lkp, but
> no explanation why it thinks it could ever be null. Hmm, maybe there
> is a codepath somewhere that has a null check on the return value?
hi Dan, can you help on this to share some idea?

The original report is at
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org/thread/F3MVBRGF2R4URBNLNY3GMTSDZUCBX6RF/

Thanks


> 
> -- 
> Ville Syrjälä
> Intel
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