From: Stefan Agner <stefan@agner.ch>
Date: Thu, 3 Dec 2015 02:03:50 +0000 (-0800)
Subject: drm/fsl-dcu: handle missing panel gracefully
X-Git-Tag: v4.7-rc1~77^2~38^2~5
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=b7d11305b89a0d3d13d6087505daed94dde08574;p=thirdparty%2Fkernel%2Flinux.git

drm/fsl-dcu: handle missing panel gracefully

If the device tree property fsl,panel is missing, drm_panel_attach
is called with a NULL pointer as first argument. Having a panel is
basically mandatory since RGB is the only supported connector.
Check if a panel node has been found, return -ENODEV and cleanup
otherwise.

Signed-off-by: Stefan Agner <stefan@agner.ch>
---

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
index 20fb7b0f25712..98c998da91eb0 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
@@ -171,14 +171,18 @@ int fsl_dcu_drm_connector_create(struct fsl_dcu_drm_device *fsl_dev,
 				      DRM_MODE_DPMS_OFF);
 
 	panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
-	if (panel_node) {
-		fsl_dev->connector.panel = of_drm_find_panel(panel_node);
-		if (!fsl_dev->connector.panel) {
-			ret = -EPROBE_DEFER;
-			goto err_sysfs;
-		}
-	of_node_put(panel_node);
+	if (!panel_node) {
+		dev_err(fsl_dev->dev, "fsl,panel property not found\n");
+		ret = -ENODEV;
+		goto err_sysfs;
+	}
+
+	fsl_dev->connector.panel = of_drm_find_panel(panel_node);
+	if (!fsl_dev->connector.panel) {
+		ret = -EPROBE_DEFER;
+		goto err_panel;
 	}
+	of_node_put(panel_node);
 
 	ret = drm_panel_attach(fsl_dev->connector.panel, connector);
 	if (ret) {
@@ -188,6 +192,8 @@ int fsl_dcu_drm_connector_create(struct fsl_dcu_drm_device *fsl_dev,
 
 	return 0;
 
+err_panel:
+	of_node_put(panel_node);
 err_sysfs:
 	drm_connector_unregister(connector);
 err_cleanup: