[PATCH] drm/rockchip: fix dma_alloc_attrs() error check

[Daniel Kurtz]

dma_alloc_attrs() returns NULL if it cannot allocate a dma buffer (or
mapping), not a negative error code.

Rerported-by: Pawel Osciak <posciak at chromium.org>
Signed-off-by: Daniel Kurtz <djkurtz at chromium.org>
---
 drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c 
b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
index bc98a22..7ca8799e 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
@@ -34,12 +34,9 @@ static int rockchip_gem_alloc_buf(struct rockchip_gem_object 
*rk_obj)
        rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
                                         &rk_obj->dma_addr, GFP_KERNEL,
                                         &rk_obj->dma_attrs);
-       if (IS_ERR(rk_obj->kvaddr)) {
-               int ret = PTR_ERR(rk_obj->kvaddr);
-
-               DRM_ERROR("failed to allocate %#x byte dma buffer, %d",
-                         obj->size, ret);
-               return ret;
+       if (!rk_obj->kvaddr) {
+               DRM_ERROR("failed to allocate %#x byte dma buffer", obj->size);
+               return -ENOMEM;
        }

        return 0;
-- 
2.2.0.rc0.207.ga3a616c