[PATCH] drm/amd/display: Trigger bug when allocation fails.

[Harry Wentland]

On 2017-10-17 06:05 PM, Andrey Grodzovsky wrote:
> 
> 
> On 10/17/2017 05:11 PM, Tom St Denis wrote:
>> I'm ok with not pushing my commit and simply adding an else branch that sets the pointer to NULL.
>>
>> (maybe put a WARN_ON to give context?)
> 
> Seems reasonable to me.
> Harry ?
> 

Sure.

Harry

> Andrey
> 
>>
>> Tom
>>
>> On 17/10/17 04:42 PM, Andrey Grodzovsky wrote:
>>>
>>>
>>> On 10/17/2017 04:12 PM, Nicolai Hähnle wrote:
>>>> On 17.10.2017 19:45, Tom St Denis wrote:
>>>>> If the allocation fails in amdgpu_dm_connector_funcs_reset() the
>>>>> API cannot continue so trigger a BUG_ON.
>>>>
>>>> That seems questionable to be honest. The drm_atomic_helper version of this function ends up setting connector->state = NULL; in this case.
>>>
>>> I see it now, it will propagate back to user mode as -ENOMEM, so i guess it's good just set it as NULL.
>>>
>>> Thanks,
>>> Andrey
>>>
>>>>
>>>> Cheers,
>>>> Nicolai
>>>>
>>>>>
>>>>> Signed-off-by: Tom St Denis <tom.stdenis at amd.com>
>>>>> ---
>>>>>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 1 +
>>>>>   1 file changed, 1 insertion(+)
>>>>>
>>>>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>>>>> index 58e29a2a5ca6..ac58ba4f10cf 100644
>>>>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>>>>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>>>>> @@ -2722,6 +2722,7 @@ void amdgpu_dm_connector_funcs_reset(struct drm_connector *connector)
>>>>>       kfree(state);
>>>>>         state = kzalloc(sizeof(*state), GFP_KERNEL);
>>>>> +    BUG_ON(state == NULL);
>>>>>         if (state) {
>>>>>           state->scaling = RMX_OFF;
>>>>>
>>>>
>>>>
>>>
>>
>