drm/mcde: Drop explicit drm_mode_config_cleanup call

Allows us to drop the drm_driver.release callback.

This is made possible by a preceeding patch which added a drmm_
cleanup action to drm_mode_config_init(), hence all we need to do to
ensure that drm_mode_config_cleanup() is run on final drm_device
cleanup is check the new error code for _init().

v2: Explain why this cleanup is possible (Laurent).

v3: Use drmm_mode_config_init() for more clarity (Sam, Thomas)
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org> (v2)
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200323144950.3018436-33-daniel.vetter@ffwll.ch

drivers/gpu/drm/mcde/mcde_drv.c

@@ -184,13 +184,13 @@ static int mcde_modeset_init(struct drm_device *drm)
 	ret = drm_vblank_init(drm, 1);
 	if (ret) {
 		dev_err(drm->dev, "failed to init vblank\n");
-		goto out_config;
+		return ret;
 	}
 
 	ret = mcde_display_init(drm);
 	if (ret) {
 		dev_err(drm->dev, "failed to init display\n");
-		goto out_config;
+		return ret;
 	}
 
 	/*
@@ -204,7 +204,7 @@ static int mcde_modeset_init(struct drm_device *drm)
 						    mcde->bridge);
 	if (ret) {
 		dev_err(drm->dev, "failed to attach display output bridge\n");
-		goto out_config;
+		return ret;
 	}
 
 	drm_mode_config_reset(drm);
@@ -212,15 +212,6 @@ static int mcde_modeset_init(struct drm_device *drm)
 	drm_fbdev_generic_setup(drm, 32);
 
 	return 0;
-
-out_config:
-	drm_mode_config_cleanup(drm);
-	return ret;
-}
-
-static void mcde_release(struct drm_device *drm)
-{
-	drm_mode_config_cleanup(drm);
 }
 
 DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
@@ -228,7 +219,6 @@ DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
 static struct drm_driver mcde_drm_driver = {
 	.driver_features =
 		DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
-	.release = mcde_release,
 	.lastclose = drm_fb_helper_lastclose,
 	.ioctls = NULL,
 	.fops = &drm_fops,
@@ -256,7 +246,9 @@ static int mcde_drm_bind(struct device *dev)
 	struct drm_device *drm = dev_get_drvdata(dev);
 	int ret;
 
-	drm_mode_config_init(drm);
+	ret = drmm_mode_config_init(drm);
+	if (ret)
+		return ret;
 
 	ret = component_bind_all(drm->dev, drm);
 	if (ret) {