[PATCH 2/2] drm/amd/amdgpu: fix locking in bo creation error path

[deathsimple@xxxxxxxxxxx (Christian König)]

Am 11.01.2017 um 08:31 schrieb Nicolai Hähnle:
> From: Nicolai Hähnle <nicolai.haehnle at amd.com>
>
> Unlock the resv lock only if we were the ones to lock it in the first
> place.
>
> Signed-off-by: Nicolai Hähnle <nicolai.haehnle at amd.com>

Reviewed-by: Christian König <christian.koenig at amd.com>.

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> index 357eed9..d9d6793 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> @@ -401,21 +401,22 @@ int amdgpu_bo_create_restricted(struct amdgpu_device *adev,
>   	}
>   	if (!resv)
>   		ww_mutex_unlock(&bo->tbo.resv->lock);
>   	*bo_ptr = bo;
>   
>   	trace_amdgpu_bo_create(bo);
>   
>   	return 0;
>   
>   fail_unreserve:
> -	ww_mutex_unlock(&bo->tbo.resv->lock);
> +	if (!resv)
> +		ww_mutex_unlock(&bo->tbo.resv->lock);
>   	amdgpu_bo_unref(&bo);
>   	return r;
>   }
>   
>   static int amdgpu_bo_create_shadow(struct amdgpu_device *adev,
>   				   unsigned long size, int byte_align,
>   				   struct amdgpu_bo *bo)
>   {
>   	struct ttm_placement placement = {0};
>   	struct ttm_place placements[AMDGPU_GEM_DOMAIN_MAX + 1];