[PATCH] drm/scheduler: fix drm_sched_job_add_implicit_dependencies

[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?

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.

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
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch