Merge ra.kernel.org:/pub/scm/linux/kernel/git/netdev/net

Some of the devlink bits were tricky, but I think I got it right.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 20 insertions, 13 deletions

diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c
index fd67efe37c63..056ab9d5f313 100644
--- a/drivers/gpu/drm/drm_client.c
+++ b/drivers/gpu/drm/drm_client.c
@@ -233,21 +233,17 @@ void drm_client_dev_restore(struct drm_device *dev)
 
 static void drm_client_buffer_delete(struct drm_client_buffer *buffer)
 {
-	struct drm_device *dev = buffer->client->dev;
-
 	if (buffer->gem) {
 		drm_gem_vunmap_unlocked(buffer->gem, &buffer->map);
 		drm_gem_object_put(buffer->gem);
 	}
 
-	if (buffer->handle)
-		drm_mode_destroy_dumb(dev, buffer->handle, buffer->client->file);
-
 	kfree(buffer);
 }
 
 static struct drm_client_buffer *
-drm_client_buffer_create(struct drm_client_dev *client, u32 width, u32 height, u32 format)
+drm_client_buffer_create(struct drm_client_dev *client, u32 width, u32 height,
+			 u32 format, u32 *handle)
 {
 	const struct drm_format_info *info = drm_format_info(format);
 	struct drm_mode_create_dumb dumb_args = { };
@@ -269,16 +265,15 @@ drm_client_buffer_create(struct drm_client_dev *client, u32 width, u32 height, u
 	if (ret)
 		goto err_delete;
 
-	buffer->handle = dumb_args.handle;
-	buffer->pitch = dumb_args.pitch;
-
 	obj = drm_gem_object_lookup(client->file, dumb_args.handle);
 	if (!obj)  {
 		ret = -ENOENT;
 		goto err_delete;
 	}
 
+	buffer->pitch = dumb_args.pitch;
 	buffer->gem = obj;
+	*handle = dumb_args.handle;
 
 	return buffer;
 
@@ -365,7 +360,8 @@ static void drm_client_buffer_rmfb(struct drm_client_buffer *buffer)
 }
 
 static int drm_client_buffer_addfb(struct drm_client_buffer *buffer,
-				   u32 width, u32 height, u32 format)
+				   u32 width, u32 height, u32 format,
+				   u32 handle)
 {
 	struct drm_client_dev *client = buffer->client;
 	struct drm_mode_fb_cmd fb_req = { };
@@ -377,7 +373,7 @@ static int drm_client_buffer_addfb(struct drm_client_buffer *buffer,
 	fb_req.depth = info->depth;
 	fb_req.width = width;
 	fb_req.height = height;
-	fb_req.handle = buffer->handle;
+	fb_req.handle = handle;
 	fb_req.pitch = buffer->pitch;
 
 	ret = drm_mode_addfb(client->dev, &fb_req, client->file);
@@ -414,13 +410,24 @@ struct drm_client_buffer *
 drm_client_framebuffer_create(struct drm_client_dev *client, u32 width, u32 height, u32 format)
 {
 	struct drm_client_buffer *buffer;
+	u32 handle;
 	int ret;
 
-	buffer = drm_client_buffer_create(client, width, height, format);
+	buffer = drm_client_buffer_create(client, width, height, format,
+					  &handle);
 	if (IS_ERR(buffer))
 		return buffer;
 
-	ret = drm_client_buffer_addfb(buffer, width, height, format);
+	ret = drm_client_buffer_addfb(buffer, width, height, format, handle);
+
+	/*
+	 * The handle is only needed for creating the framebuffer, destroy it
+	 * again to solve a circular dependency should anybody export the GEM
+	 * object as DMA-buf. The framebuffer and our buffer structure are still
+	 * holding references to the GEM object to prevent its destruction.
+	 */
+	drm_mode_destroy_dumb(client->dev, handle, client->file);
+
 	if (ret) {
 		drm_client_buffer_delete(buffer);
 		return ERR_PTR(ret);