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

[Andrey Grodzovsky]

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 ?

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;
>>>>
>>>
>>>
>>
>