drm/tilcdc: Fix tilcdc_crtc_create() return value handling

Failed tilcdc_crtc_create() error handling was broken, this patch
should fix it.
Signed-off-by: Jyri Sarha <jsarha@ti.com>
Tested-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

drivers/gpu/drm/tilcdc/tilcdc_crtc.c

@@ -957,7 +957,7 @@ irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
 	return IRQ_HANDLED;
 }
 
-struct drm_crtc *tilcdc_crtc_create(struct drm_device *dev)
+int tilcdc_crtc_create(struct drm_device *dev)
 {
 	struct tilcdc_drm_private *priv = dev->dev_private;
 	struct tilcdc_crtc *tilcdc_crtc;
@@ -967,7 +967,7 @@ struct drm_crtc *tilcdc_crtc_create(struct drm_device *dev)
 	tilcdc_crtc = devm_kzalloc(dev->dev, sizeof(*tilcdc_crtc), GFP_KERNEL);
 	if (!tilcdc_crtc) {
 		dev_err(dev->dev, "allocation failed\n");
-		return NULL;
+		return -ENOMEM;
 	}
 
 	if (priv->rev == 1) {
@@ -977,7 +977,7 @@ struct drm_crtc *tilcdc_crtc_create(struct drm_device *dev)
 					&tilcdc_crtc->palette_dma_handle,
 					GFP_KERNEL | __GFP_ZERO);
 		if (!tilcdc_crtc->palette_base)
-			return ERR_PTR(-ENOMEM);
+			return -ENOMEM;
 	}
 
 	crtc = &tilcdc_crtc->base;
@@ -1020,13 +1020,15 @@ struct drm_crtc *tilcdc_crtc_create(struct drm_device *dev)
 		if (!crtc->port) { /* This should never happen */
 			dev_err(dev->dev, "Port node not found in %s\n",
 				dev->dev->of_node->full_name);
+			ret = -EINVAL;
 			goto fail;
 		}
 	}
 
-	return crtc;
+	priv->crtc = crtc;
+	return 0;
 
 fail:
 	tilcdc_crtc_destroy(crtc);
-	return NULL;
+	return -ENOMEM;
 }

drivers/gpu/drm/tilcdc/tilcdc_drv.c

@@ -153,13 +153,11 @@ static const struct drm_mode_config_funcs mode_config_funcs = {
 	.atomic_commit = tilcdc_commit,
 };
 
-static int modeset_init(struct drm_device *dev)
+static void modeset_init(struct drm_device *dev)
 {
 	struct tilcdc_drm_private *priv = dev->dev_private;
 	struct tilcdc_module *mod;
 
-	priv->crtc = tilcdc_crtc_create(dev);
-
 	list_for_each_entry(mod, &module_list, list) {
 		DBG("loading module: %s", mod->name);
 		mod->funcs->modeset_init(mod, dev);
@@ -170,8 +168,6 @@ static int modeset_init(struct drm_device *dev)
 	dev->mode_config.max_width = tilcdc_crtc_max_width(priv->crtc);
 	dev->mode_config.max_height = 2048;
 	dev->mode_config.funcs = &mode_config_funcs;
-
-	return 0;
 }
 
 #ifdef CONFIG_CPU_FREQ
@@ -370,11 +366,12 @@ static int tilcdc_init(struct drm_driver *ddrv, struct device *dev)
 		}
 	}
 
-	ret = modeset_init(ddev);
+	ret = tilcdc_crtc_create(ddev);
 	if (ret < 0) {
-		dev_err(dev, "failed to initialize mode setting\n");
+		dev_err(dev, "failed to create crtc\n");
 		goto init_failed;
 	}
+	modeset_init(ddev);
 
 	if (priv->is_componentized) {
 		ret = component_bind_all(dev, ddev);

drivers/gpu/drm/tilcdc/tilcdc_drv.h

@@ -168,7 +168,7 @@ struct tilcdc_panel_info {
 
 #define DBG(fmt, ...) DRM_DEBUG(fmt"\n", ##__VA_ARGS__)
 
-struct drm_crtc *tilcdc_crtc_create(struct drm_device *dev);
+int tilcdc_crtc_create(struct drm_device *dev);
 irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc);
 void tilcdc_crtc_update_clk(struct drm_crtc *crtc);
 void tilcdc_crtc_set_panel_info(struct drm_crtc *crtc,