[PATCH v3] drm/amdgpu: Fix a deadlock if previous GEM object allocation fails

[Christian König]

Am 31.08.21 um 09:08 schrieb Pan, Xinhui:
> Fall through to handle the error instead of return.
>
> Fixes: f8aab60422c37 ("drm/amdgpu: Initialise drm_gem_object_funcs for
> imported BOs")
> Cc: stable at vger.kernel.org
> Signed-off-by: xinhui pan <xinhui.pan at amd.com>

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

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 23 ++++++++++-------------
>   1 file changed, 10 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> index 85b292ed5c43..9e2525b96d04 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> @@ -341,21 +341,18 @@ int amdgpu_gem_create_ioctl(struct drm_device *dev, void *data,
>   	r = amdgpu_gem_object_create(adev, size, args->in.alignment,
>   				     initial_domain,
>   				     flags, ttm_bo_type_device, resv, &gobj);
> -	if (r) {
> -		if (r != -ERESTARTSYS) {
> -			if (flags & AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED) {
> -				flags &= ~AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;
> -				goto retry;
> -			}
> +	if (r && r != -ERESTARTSYS) {
> +		if (flags & AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED) {
> +			flags &= ~AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;
> +			goto retry;
> +		}
>   
> -			if (initial_domain == AMDGPU_GEM_DOMAIN_VRAM) {
> -				initial_domain |= AMDGPU_GEM_DOMAIN_GTT;
> -				goto retry;
> -			}
> -			DRM_DEBUG("Failed to allocate GEM object (%llu, %d, %llu, %d)\n",
> -				  size, initial_domain, args->in.alignment, r);
> +		if (initial_domain == AMDGPU_GEM_DOMAIN_VRAM) {
> +			initial_domain |= AMDGPU_GEM_DOMAIN_GTT;
> +			goto retry;
>   		}
> -		return r;
> +		DRM_DEBUG("Failed to allocate GEM object (%llu, %d, %llu, %d)\n",
> +				size, initial_domain, args->in.alignment, r);
>   	}
>   
>   	if (flags & AMDGPU_GEM_CREATE_VM_ALWAYS_VALID) {