[Nouveau] [PATCH 1/2] drm/ttm: fix broken merge between drm-next and drm-misc-next

[Christian König]

Please ignore this one, it's to hot here and I'm typing to fast :)

Christian.

Am 20.08.20 um 17:24 schrieb Christian König:
> drm-next reverted the changes to ttm_tt_create() to do the
> NULL check inside the function, but drm-misc-next adds new
> users of this approach.
>
> Re-apply the NULL check change inside the function to fix this.
>
> Signed-off-by: Christian König <christian.koenig at amd.com>
> Reviewed-by: Dave Airlie <airlied at redhat.com>
> Link: https://patchwork.freedesktop.org/patch/386628/
> ---
>   drivers/gpu/drm/ttm/ttm_bo.c | 2 +-
>   drivers/gpu/drm/ttm/ttm_tt.c | 4 +++-
>   2 files changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
> index 97ac662a47cb..e3931e515906 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
> @@ -1180,7 +1180,7 @@ int ttm_bo_validate(struct ttm_buffer_object *bo,
>   	/*
>   	 * We might need to add a TTM.
>   	 */
> -	if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
> +	if (bo->mem.mem_type == TTM_PL_SYSTEM) {
>   		ret = ttm_tt_create(bo, true);
>   		if (ret)
>   			return ret;
> diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
> index 9aa4fbe386e6..1ccf1ef050d6 100644
> --- a/drivers/gpu/drm/ttm/ttm_tt.c
> +++ b/drivers/gpu/drm/ttm/ttm_tt.c
> @@ -50,6 +50,9 @@ int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
>   
>   	dma_resv_assert_held(bo->base.resv);
>   
> +	if (bo->ttm)
> +		return 0;
> +
>   	if (bdev->need_dma32)
>   		page_flags |= TTM_PAGE_FLAG_DMA32;
>   
> @@ -67,7 +70,6 @@ int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
>   		page_flags |= TTM_PAGE_FLAG_SG;
>   		break;
>   	default:
> -		bo->ttm = NULL;
>   		pr_err("Illegal buffer object type\n");
>   		return -EINVAL;
>   	}