drm/prime: fix to check return of dma_map_sg in prime helper
The dma_map_sg(), in map_dma_buf callback operation of prime helper,
can return 0 when it fails to map, so it needs to release related
resources.
Signed-off-by: YoungJun Cho <yj44.cho@samsung.com>
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@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 e57c675..0daf212 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -97,8 +97,13 @@
sgt = obj->dev->driver->gem_prime_get_sg_table(obj);
- if (!IS_ERR_OR_NULL(sgt))
- dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir);
+ if (!IS_ERR_OR_NULL(sgt)) {
+ if (!dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir)) {
+ sg_free_table(sgt);
+ kfree(sgt);
+ sgt = ERR_PTR(-ENOMEM);
+ }
+ }
mutex_unlock(&obj->dev->struct_mutex);
return sgt;