From: Joonyoung Shim <jy0922.shim@samsung.com>
Date: Thu, 4 Jul 2013 07:19:12 +0000 (+0900)
Subject: drm/prime: fix sgt NULL checking
X-Git-Tag: accepted/tizen/mobile/20160113.050904~35
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0597d841d70fa2d554f994490bbf16a70dc7f279;p=profile%2Fmobile%2Fplatform%2Fkernel%2Flinux-3.10-sc7730.git

drm/prime: fix sgt NULL checking

The drm_gem_map_detach() can be called with sgt is NULL.

Change-Id: I2a422a1bf92333e60de902ab048048f0b4c754dc
Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
---

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 1e0de41..ff5fece 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -119,12 +119,13 @@ static void drm_gem_map_detach(struct dma_buf *dma_buf,
 		return;
 
 	sgt = prime_attach->sgt;
+	if (sgt) {
+		if (prime_attach->dir != DMA_NONE)
+			dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents,
+					prime_attach->dir);
+		sg_free_table(sgt);
+	}
 
-	if (prime_attach->dir != DMA_NONE)
-		dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents,
-				prime_attach->dir);
-
-	sg_free_table(sgt);
 	kfree(sgt);
 	kfree(prime_attach);
 	attach->priv = NULL;