[PATCH v4] drm/scheduler: Avoid accessing freed bad job.

[Andrey Grodzovsky]

Lucas - Ping on my question and also I attached this temporary solution 
for etnaviv to clarify my point. If that something acceptable for now at 
least i can do the same for v3d where it requires a bit more code changes.

Andrey

On 2/6/20 10:49 AM, Andrey Grodzovsky wrote:
>> Well a revert would break our driver.
>>
>> The real solution is that somebody needs to sit down, gather ALL the 
>> requirements and then come up with a solution which is clean and 
>> works for everyone.
>>
>> Christian.
>
>
> I can to take on this as indeed our general design on this becomes 
> more and more entangled as GPU reset scenarios grow in complexity (at 
> least in AMD driver). Currently I am on a high priority internal task 
> which should take me around a week or 2 to finish and after that I can 
> get to it.
>
> Regarding temporary solution  - I looked into v3d and etnaviv use 
> cases and we in AMD actually face the same scenario where we decide to 
> skip HW reset if the guilty job did finish by the time we are 
> processing the timeout  (see amdgpu_device_gpu_recover and 
> skip_hw_reset goto) - the difference is we always call 
> drm_sched_stop/start irrespectively of whether we are going to 
> actually HW reset or not (same as extend timeout). I wonder if 
> something like this can be done also for ve3 and etnaviv ?
>
> Andrey 
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