Re: [PATCH] dmr/amdgpu: Fix wrongly unref of BO

[zhoucm1 <david1.zhou-5C7GfCeVMHo@public.gmane.org>]

On 2017年04月14日 05:34, Alex Xie wrote:
> According to comment of amdgpu_bo_reserve, amdgpu_bo_reserve
> can return with -ERESTARTSYS. When this function was interrupted
> by a signal, BO should not be unref. Otherwise the BO might be
> released while is kmapped and pinned, or BO MIGHT be deref
> multiple times, etc.
         r = amdgpu_bo_reserve(adev->vram_scratch.robj, false);
we have specified interruptible to false, so -ERESTARTSYS isn't possible 
here.

Thanks,
David Zhou
>
> Change-Id: If76071a768950a0d3ad9d5da7fcae04881807621
> Signed-off-by: Alex Xie <AlexBin.Xie@amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 53996e3..1dcc2d1 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -355,8 +355,8 @@ static void amdgpu_vram_scratch_fini(struct amdgpu_device *adev)
>   		amdgpu_bo_kunmap(adev->vram_scratch.robj);
>   		amdgpu_bo_unpin(adev->vram_scratch.robj);
>   		amdgpu_bo_unreserve(adev->vram_scratch.robj);
> +		amdgpu_bo_unref(&adev->vram_scratch.robj);
>   	}
> -	amdgpu_bo_unref(&adev->vram_scratch.robj);
>   }
>   
>   /**

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