Re: [PATCH v2] drm/amdgpu: Reserve shared fence slot in amdgpu_vm_update_directories

["Zhang, Jerry (Junwei)" <Jerry.Zhang-5C7GfCeVMHo@public.gmane.org>]

On 06/25/2018 05:07 PM, Michel Dänzer wrote:
> From: Michel Dänzer <michel.daenzer@amd.com>
>
> Without this, there could not be enough slots, which could trigger the
> BUG_ON in reservation_object_add_shared_fence.
>
> v2:
> * Jump to the error label instead of returning directly (Jerry Zhang)
>
> Cc: stable@vger.kernel.org
> Bugzilla: https://bugs.freedesktop.org/106418
> Reported-by: mikhail.v.gavrilov@gmail.com
> Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 4 ++++
>   1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index 590db78b8c72..579bcc33d544 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -1111,6 +1111,10 @@ int amdgpu_vm_update_directories(struct amdgpu_device *adev,
>   		struct amdgpu_ring *ring;
>   		struct dma_fence *fence;
>
> +		r = reservation_object_reserve_shared(root->tbo.resv);
> +		if (r)
> +			goto error;
> +
>   		ring = container_of(vm->entity.sched, struct amdgpu_ring,
>   				    sched);
>
>
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