[PATCH] drm/scheduler: fix drm_sched_job_add_implicit_dependencies

[Christian König]

Am 19.10.21 um 14:35 schrieb Daniel Vetter:
> On Tue, Oct 19, 2021 at 01:27:06PM +0200, Christian König wrote:
>> Trivial fix since we now need to grab a reference to the fence we have
>> added. Previously the dma_resv function where doing that for us.
>>
>> Signed-off-by: Christian König <christian.koenig at amd.com>
>> Fixes: 9c2ba265352a drm/scheduler: ("use new iterator in drm_sched_job_add_implicit_dependencies v2")
> Uh I completely missed checking for that. Did you review all other
> conversions you've pushed for this kind of bug?

Yeah, currently double checking that.

> Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
>
> Also
>
> Reported-by: Nicolas Frattaroli <frattaroli.nicolas at gmail.com>
> References: https://lore.kernel.org/dri-devel/2023306.UmlnhvANQh@archbook/
>
> It's important to credit bug reporters! Also upgrade to t-b if Nicolas
> gets around to testing quickly.

Yeah, the credit part is certainly correct. I just usually ask people 
before adding their mail address to kernel commits because of the spam 
you get :)

Cheers,
Christian.

>
> Cheers, Daniel
>
>> ---
>>   drivers/gpu/drm/scheduler/sched_main.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
>> index 5bc5f775abe1..94fe51b3caa2 100644
>> --- a/drivers/gpu/drm/scheduler/sched_main.c
>> +++ b/drivers/gpu/drm/scheduler/sched_main.c
>> @@ -707,6 +707,9 @@ int drm_sched_job_add_implicit_dependencies(struct drm_sched_job *job,
>>   		ret = drm_sched_job_add_dependency(job, fence);
>>   		if (ret)
>>   			return ret;
>> +
>> +		/* Make sure to grab an additional ref on the added fence */
>> +		dma_fence_get(fence);
>>   	}
>>   	return 0;
>>   }
>> -- 
>> 2.25.1
>>