drm/gud: fix accidentally deleted IS_ERR() check

[PATCH] drm/gud: fix accidentally deleted IS_ERR() check

Posted by Ruben Wauters 1 week, 2 days ago

During conversion of WARN_ON_ONCE to drm_WARN_ON_ONCE in commit
2d2f1dc74cfb ("drm: gud: replace WARN_ON/WARN_ON_ONCE with drm
versions"), the IS_ERR check was accidentally removed, breaking the
gud_connector_add_properties() function, as any valid pointer in
state_val would produce an error.

The warning was reported by kernel test robot, and is fixed in this patch.

Fixes: 2d2f1dc74cfb ("drm: gud: replace WARN_ON/WARN_ON_ONCE with drm versions")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202509212215.c8v3RKmL-lkp@intel.com/
Signed-off-by: Ruben Wauters <rubenru09@aol.com>
---
 drivers/gpu/drm/gud/gud_connector.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/gud/gud_connector.c b/drivers/gpu/drm/gud/gud_connector.c
index 62e349b06dbe..1726a3fadff8 100644
--- a/drivers/gpu/drm/gud/gud_connector.c
+++ b/drivers/gpu/drm/gud/gud_connector.c
@@ -593,7 +593,7 @@ int gud_connector_fill_properties(struct drm_connector_state *connector_state,
 			unsigned int *state_val;
 
 			state_val = gud_connector_tv_state_val(prop, &connector_state->tv);
-			if (drm_WARN_ON_ONCE(connector_state->connector->dev, state_val))
+			if (drm_WARN_ON_ONCE(connector_state->connector->dev, IS_ERR(state_val)))
 				return PTR_ERR(state_val);
 
 			val = *state_val;
-- 
2.49.1

Re: [PATCH] drm/gud: fix accidentally deleted IS_ERR() check

Posted by Thomas Zimmermann 1 week, 1 day ago

FYI I got the following warnings. I'll fix them when I merge the patch.

-:6: ERROR:GIT_COMMIT_ID: Please use git commit description style 
'commit <12+ chars of sha1> ("<title line>")' - ie: 'commit 2d2f1dc74cfb 
("drm: gud: replace WARN_ON/WARN_ON_ONCE with drm versions")'
#6:
During conversion of WARN_ON_ONCE to drm_WARN_ON_ONCE in commit

-:15: WARNING:BAD_REPORTED_BY_LINK: Reported-by: should be immediately 
followed by Closes: with a URL to the report
#15:
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>


Am 22.09.25 um 19:32 schrieb Ruben Wauters:
> During conversion of WARN_ON_ONCE to drm_WARN_ON_ONCE in commit
> 2d2f1dc74cfb ("drm: gud: replace WARN_ON/WARN_ON_ONCE with drm
> versions"), the IS_ERR check was accidentally removed, breaking the
> gud_connector_add_properties() function, as any valid pointer in
> state_val would produce an error.
>
> The warning was reported by kernel test robot, and is fixed in this patch.
>
> Fixes: 2d2f1dc74cfb ("drm: gud: replace WARN_ON/WARN_ON_ONCE with drm versions")
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
> Closes: https://lore.kernel.org/r/202509212215.c8v3RKmL-lkp@intel.com/
> Signed-off-by: Ruben Wauters <rubenru09@aol.com>
> ---
>   drivers/gpu/drm/gud/gud_connector.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/gud/gud_connector.c b/drivers/gpu/drm/gud/gud_connector.c
> index 62e349b06dbe..1726a3fadff8 100644
> --- a/drivers/gpu/drm/gud/gud_connector.c
> +++ b/drivers/gpu/drm/gud/gud_connector.c
> @@ -593,7 +593,7 @@ int gud_connector_fill_properties(struct drm_connector_state *connector_state,
>   			unsigned int *state_val;
>   
>   			state_val = gud_connector_tv_state_val(prop, &connector_state->tv);
> -			if (drm_WARN_ON_ONCE(connector_state->connector->dev, state_val))
> +			if (drm_WARN_ON_ONCE(connector_state->connector->dev, IS_ERR(state_val)))
>   				return PTR_ERR(state_val);
>   
>   			val = *state_val;

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

Re: [PATCH] drm/gud: fix accidentally deleted IS_ERR() check

Posted by Ruben Wauters 1 week, 1 day ago

On Tue, 2025-09-23 at 09:57 +0200, Thomas Zimmermann wrote:
> FYI I got the following warnings. I'll fix them when I merge the
> patch.
> 
> -:6: ERROR:GIT_COMMIT_ID: Please use git commit description style 
> 'commit <12+ chars of sha1> ("<title line>")' - ie: 'commit
> 2d2f1dc74cfb 
> ("drm: gud: replace WARN_ON/WARN_ON_ONCE with drm versions")'
> #6:
> During conversion of WARN_ON_ONCE to drm_WARN_ON_ONCE in commit

I'm not 100% sure why it's complaining about this one, the format
matches. I assume it's a problem with the line break in it? but I'm not
100% sure.

> -:15: WARNING:BAD_REPORTED_BY_LINK: Reported-by: should be
> immediately 
> followed by Closes: with a URL to the report
> #15:
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <dan.carpenter@linaro.org>

I believe it's intentional to have two reported bys in a row, as both
of them are followed by a Closes tag at the end.

Thanks

> Am 22.09.25 um 19:32 schrieb Ruben Wauters:
> > During conversion of WARN_ON_ONCE to drm_WARN_ON_ONCE in commit
> > 2d2f1dc74cfb ("drm: gud: replace WARN_ON/WARN_ON_ONCE with drm
> > versions"), the IS_ERR check was accidentally removed, breaking the
> > gud_connector_add_properties() function, as any valid pointer in
> > state_val would produce an error.
> > 
> > The warning was reported by kernel test robot, and is fixed in this
> > patch.
> > 
> > Fixes: 2d2f1dc74cfb ("drm: gud: replace WARN_ON/WARN_ON_ONCE with
> > drm versions")
> > Reported-by: kernel test robot <lkp@intel.com>
> > Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
> > Closes:
> > https://lore.kernel.org/r/202509212215.c8v3RKmL-lkp@intel.com/
> > Signed-off-by: Ruben Wauters <rubenru09@aol.com>
> > ---
> >   drivers/gpu/drm/gud/gud_connector.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/gud/gud_connector.c
> > b/drivers/gpu/drm/gud/gud_connector.c
> > index 62e349b06dbe..1726a3fadff8 100644
> > --- a/drivers/gpu/drm/gud/gud_connector.c
> > +++ b/drivers/gpu/drm/gud/gud_connector.c
> > @@ -593,7 +593,7 @@ int gud_connector_fill_properties(struct
> > drm_connector_state *connector_state,
> >   			unsigned int *state_val;
> >   
> >   			state_val =
> > gud_connector_tv_state_val(prop, &connector_state->tv);
> > -			if (drm_WARN_ON_ONCE(connector_state-
> > >connector->dev, state_val))
> > +			if (drm_WARN_ON_ONCE(connector_state-
> > >connector->dev, IS_ERR(state_val)))
> >   				return PTR_ERR(state_val);
> >   
> >   			val = *state_val;

Re: [PATCH] drm/gud: fix accidentally deleted IS_ERR() check

Posted by Thomas Zimmermann 1 week, 1 day ago

Hi

Am 23.09.25 um 11:38 schrieb Ruben Wauters:
> On Tue, 2025-09-23 at 09:57 +0200, Thomas Zimmermann wrote:
>> FYI I got the following warnings. I'll fix them when I merge the
>> patch.
>>
>> -:6: ERROR:GIT_COMMIT_ID: Please use git commit description style
>> 'commit <12+ chars of sha1> ("<title line>")' - ie: 'commit
>> 2d2f1dc74cfb
>> ("drm: gud: replace WARN_ON/WARN_ON_ONCE with drm versions")'
>> #6:
>> During conversion of WARN_ON_ONCE to drm_WARN_ON_ONCE in commit
> I'm not 100% sure why it's complaining about this one, the format
> matches. I assume it's a problem with the line break in it? but I'm not
> 100% sure.
>
>> -:15: WARNING:BAD_REPORTED_BY_LINK: Reported-by: should be
>> immediately
>> followed by Closes: with a URL to the report
>> #15:
>> Reported-by: kernel test robot <lkp@intel.com>
>> Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
> I believe it's intentional to have two reported bys in a row, as both
> of them are followed by a Closes tag at the end.

Neither warning is really your fault. As you say the script doesn't like 
line breaks in certain places. It also only wants pairs of Closes/R-b tags.

Best regards
Thomas

>
> Thanks
>
>> Am 22.09.25 um 19:32 schrieb Ruben Wauters:
>>> During conversion of WARN_ON_ONCE to drm_WARN_ON_ONCE in commit
>>> 2d2f1dc74cfb ("drm: gud: replace WARN_ON/WARN_ON_ONCE with drm
>>> versions"), the IS_ERR check was accidentally removed, breaking the
>>> gud_connector_add_properties() function, as any valid pointer in
>>> state_val would produce an error.
>>>
>>> The warning was reported by kernel test robot, and is fixed in this
>>> patch.
>>>
>>> Fixes: 2d2f1dc74cfb ("drm: gud: replace WARN_ON/WARN_ON_ONCE with
>>> drm versions")
>>> Reported-by: kernel test robot <lkp@intel.com>
>>> Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
>>> Closes:
>>> https://lore.kernel.org/r/202509212215.c8v3RKmL-lkp@intel.com/
>>> Signed-off-by: Ruben Wauters <rubenru09@aol.com>
>>> ---
>>>    drivers/gpu/drm/gud/gud_connector.c | 2 +-
>>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/gpu/drm/gud/gud_connector.c
>>> b/drivers/gpu/drm/gud/gud_connector.c
>>> index 62e349b06dbe..1726a3fadff8 100644
>>> --- a/drivers/gpu/drm/gud/gud_connector.c
>>> +++ b/drivers/gpu/drm/gud/gud_connector.c
>>> @@ -593,7 +593,7 @@ int gud_connector_fill_properties(struct
>>> drm_connector_state *connector_state,
>>>    			unsigned int *state_val;
>>>    
>>>    			state_val =
>>> gud_connector_tv_state_val(prop, &connector_state->tv);
>>> -			if (drm_WARN_ON_ONCE(connector_state-
>>>> connector->dev, state_val))
>>> +			if (drm_WARN_ON_ONCE(connector_state-
>>>> connector->dev, IS_ERR(state_val)))
>>>    				return PTR_ERR(state_val);
>>>    
>>>    			val = *state_val;

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

Re: [PATCH] drm/gud: fix accidentally deleted IS_ERR() check

Posted by Dan Carpenter 1 week, 1 day ago

On Tue, Sep 23, 2025 at 09:57:11AM +0200, Thomas Zimmermann wrote:
> -:15: WARNING:BAD_REPORTED_BY_LINK: Reported-by: should be immediately
> followed by Closes: with a URL to the report
> #15:
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
> 

I've been meaning to add a lkp@intel.com exception to that rule in
checkpatch...  :/

regards,
dan carpenter

Re: [PATCH] drm/gud: fix accidentally deleted IS_ERR() check

Posted by Thomas Zimmermann 1 week, 1 day ago


Am 22.09.25 um 19:32 schrieb Ruben Wauters:
> During conversion of WARN_ON_ONCE to drm_WARN_ON_ONCE in commit
> 2d2f1dc74cfb ("drm: gud: replace WARN_ON/WARN_ON_ONCE with drm
> versions"), the IS_ERR check was accidentally removed, breaking the
> gud_connector_add_properties() function, as any valid pointer in
> state_val would produce an error.
>
> The warning was reported by kernel test robot, and is fixed in this patch.
>
> Fixes: 2d2f1dc74cfb ("drm: gud: replace WARN_ON/WARN_ON_ONCE with drm versions")
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
> Closes: https://lore.kernel.org/r/202509212215.c8v3RKmL-lkp@intel.com/
> Signed-off-by: Ruben Wauters <rubenru09@aol.com>

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>

> ---
>   drivers/gpu/drm/gud/gud_connector.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/gud/gud_connector.c b/drivers/gpu/drm/gud/gud_connector.c
> index 62e349b06dbe..1726a3fadff8 100644
> --- a/drivers/gpu/drm/gud/gud_connector.c
> +++ b/drivers/gpu/drm/gud/gud_connector.c
> @@ -593,7 +593,7 @@ int gud_connector_fill_properties(struct drm_connector_state *connector_state,
>   			unsigned int *state_val;
>   
>   			state_val = gud_connector_tv_state_val(prop, &connector_state->tv);
> -			if (drm_WARN_ON_ONCE(connector_state->connector->dev, state_val))
> +			if (drm_WARN_ON_ONCE(connector_state->connector->dev, IS_ERR(state_val)))
>   				return PTR_ERR(state_val);
>   
>   			val = *state_val;

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)