[PATCH] drm/rockchip: Check iommu itself instead of it's parent for device_is_available

[Andy Yan]

When iommu itself is disabled in dts, we should
fallback to non-iommu buffer, check iommu parent
is meanless here.

Signed-off-by: Andy Yan <andy.yan at rock-chips.com>
---

 drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index 212bd87c0c4a..0d20c8cc1ffa 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -366,7 +366,7 @@ static int rockchip_drm_platform_of_probe(struct device *dev)
 		}
 
 		iommu = of_parse_phandle(port->parent, "iommus", 0);
-		if (!iommu || !of_device_is_available(iommu->parent)) {
+		if (!iommu || !of_device_is_available(iommu)) {
 			DRM_DEV_DEBUG(dev,
 				      "no iommu attached for %pOF, using non-iommu buffers\n",
 				      port->parent);
-- 
2.25.1