[PATCH] drm/amdgpu: Fix for BO move issue

[Christian König]

Am 18.10.22 um 11:04 schrieb Arunpravin Paneer Selvam:
> A user reported a bug on CAPE VERDE system where uvd_v3_1
> IP component failed to initialize as there is an issue with
> BO move code from one memory to other.
>
> In function amdgpu_mem_visible() called by amdgpu_bo_move(),
> when there are no blocks to compare or if we have a single
> block then break the loop.
>
> Fixes: 312b4dc11d4f ("drm/amdgpu: Fix VRAM BO swap issue")
> Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam at amd.com>

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

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index dc262d2c2925..57277b1cf183 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -439,6 +439,9 @@ static bool amdgpu_mem_visible(struct amdgpu_device *adev,
>   	while (cursor.remaining) {
>   		amdgpu_res_next(&cursor, cursor.size);
>   
> +		if (!cursor.remaining)
> +			break;
> +
>   		/* ttm_resource_ioremap only supports contiguous memory */
>   		if (end != cursor.start)
>   			return false;