linux-kernel - Re: [PATCH] drm/stm: ltdc: fix warning in ltdc_crtc_update

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Date:   Thu, 19 Apr 2018 10:39:13 +0000
From:   Philippe CORNU <philippe.cornu@...com>
To:     Yannick FERTRE <yannick.fertre@...com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Vincent ABRIOU <vincent.abriou@...com>,
        "Dan Carpenter" <dan.carpenter@...cle.com>,
        David Airlie <airlied@...ux.ie>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Alexandre TORGUE <alexandre.torgue@...com>
Subject: Re: [PATCH] drm/stm: ltdc: fix warning in ltdc_crtc_update_clut()

Applied on drm-misc-next.
Many thanks,
Philippe :-)

On 04/16/2018 11:18 AM, Yannick FERTRE wrote:
> Reviewed-by: yannick fertre <yannick.fertre@...com>
> 
> 
> On 04/10/2018 03:53 PM, Philippe Cornu wrote:
>> Fix the warning
>> "warn: variable dereferenced before check 'crtc' (see line 390)"
>> by removing unnecessary checks as ltdc_crtc_update_clut() is
>> only called from ltdc_crtc_atomic_flush() where crtc and
>> crtc->state are not NULL.
>>
>> Many thanks to Dan Carpenter for the bug report
>> https://lists.freedesktop.org/archives/dri-devel/2018-February/166918.html
>>
>> Signed-off-by: Philippe Cornu <philippe.cornu@...com>
>> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
>> ---
>>    drivers/gpu/drm/stm/ltdc.c | 3 ---
>>    1 file changed, 3 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
>> index 061d2b6e5157..e3121d9e4230 100644
>> --- a/drivers/gpu/drm/stm/ltdc.c
>> +++ b/drivers/gpu/drm/stm/ltdc.c
>> @@ -392,9 +392,6 @@ static void ltdc_crtc_update_clut(struct drm_crtc *crtc)
>>    	u32 val;
>>    	int i;
>>    
>> -	if (!crtc || !crtc->state)
>> -		return;
>> -
>>    	if (!crtc->state->color_mgmt_changed || !crtc->state->gamma_lut)
>>    		return;
>>