drm/client: Fix: drm_client_new: Don't require DRM to be registered

Commit 894a677f4b3e ("drm/cma-helper: Use the generic fbdev emulation")
broke almost all drivers that use the CMA helper.

The reason is that drm_client_new() requires that the DRM device has
been registered, but the drivers register fbdev before registering DRM.

Remove the requirement that DRM should be registered when creating a
new client.

Fixes: c76f0f7cb546 ("drm: Begin an API for in-kernel clients")
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Icenowy Zheng <icenowy@aosc.io>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Tested-by: Icenowy Zheng <icenowy@aosc.io>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180711155632.37437-1-noralf@tronnes.org

diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c
index 4039a4d103a83acc315e2740697d1a00d93ae216..9b142f58d489ff9e67869c95dc0c6d0a46115aa0 100644 (file)
--- a/drivers/gpu/drm/drm_client.c
+++ b/drivers/gpu/drm/drm_client.c
@@ -78,7 +78,6 @@ EXPORT_SYMBOL(drm_client_close);
 int drm_client_new(struct drm_device *dev, struct drm_client_dev *client,
                   const char *name, const struct drm_client_funcs *funcs)
 {
-       bool registered;
        int ret;
 
        if (!drm_core_check_feature(dev, DRIVER_MODESET) ||
@@ -97,21 +96,13 @@ int drm_client_new(struct drm_device *dev, struct drm_client_dev *client,
                goto err_put_module;
 
        mutex_lock(&dev->clientlist_mutex);
-       registered = dev->registered;
-       if (registered)
-               list_add(&client->list, &dev->clientlist);
+       list_add(&client->list, &dev->clientlist);
        mutex_unlock(&dev->clientlist_mutex);
-       if (!registered) {
-               ret = -ENODEV;
-               goto err_close;
-       }
 
        drm_dev_get(dev);
 
        return 0;
 
-err_close:
-       drm_client_close(client);
 err_put_module:
        if (funcs)
                module_put(funcs->owner);