drm/prime: fix potential race in drm_gem_map_detach

Unpin the GEM object only after freeing the sg table.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Roger He <Hongbo.He@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180227115000.4105-1-christian.koenig@amd.com

drivers/gpu/drm/drm_prime.c

@@ -230,18 +230,14 @@ void drm_gem_map_detach(struct dma_buf *dma_buf,
 	struct drm_prime_attachment *prime_attach = attach->priv;
 	struct drm_gem_object *obj = dma_buf->priv;
 	struct drm_device *dev = obj->dev;
-	struct sg_table *sgt;
 
-	if (dev->driver->gem_prime_unpin)
-		dev->driver->gem_prime_unpin(obj);
-
-	if (!prime_attach)
-		return;
+	if (prime_attach) {
+		struct sg_table *sgt = prime_attach->sgt;
 
-	sgt = prime_attach->sgt;
 		if (sgt) {
 			if (prime_attach->dir != DMA_NONE)
-			dma_unmap_sg_attrs(attach->dev, sgt->sgl, sgt->nents,
+				dma_unmap_sg_attrs(attach->dev, sgt->sgl,
+						   sgt->nents,
 						   prime_attach->dir,
 						   DMA_ATTR_SKIP_CPU_SYNC);
 			sg_free_table(sgt);
@@ -250,6 +246,10 @@ void drm_gem_map_detach(struct dma_buf *dma_buf,
 		kfree(sgt);
 		kfree(prime_attach);
 		attach->priv = NULL;
+	}
+
+	if (dev->driver->gem_prime_unpin)
+		dev->driver->gem_prime_unpin(obj);
 }
 EXPORT_SYMBOL(drm_gem_map_detach);