From: Mark Yao <mark.yao@rock-chips.com>
Date: Fri, 9 Dec 2016 01:03:10 +0000 (+0800)
Subject: drm/rockchip: fix iommu_map_sg check
X-Git-Tag: firefly_0821_release~1115
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=ef24372b3153f3c0315e72910e461b2b8927af69;p=firefly-linux-kernel-4.4.55.git

drm/rockchip: fix iommu_map_sg check

The return value of iommu_map_sg is size_t, it's unsigned

Change-Id: Ib06f61c020510673bc513e1a8fde6fd3980a7ca3
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
---

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
index f79238149ff6..2af62e3c6d24 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
@@ -47,7 +47,7 @@ static int rockchip_gem_iommu_map(struct rockchip_gem_object *rk_obj)
 
 	ret = iommu_map_sg(private->domain, rk_obj->dma_addr, rk_obj->sgt->sgl,
 			   rk_obj->sgt->nents, prot);
-	if (ret < 0) {
+	if (ret < rk_obj->base.size) {
 		DRM_ERROR("failed to map buffer: %zd\n", ret);
 		goto err_remove_node;
 	}