linux-kernel - [PATCH] drm: Add the missed device_unregister() in drm_sysfs_connector

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Date:   Fri, 23 Oct 2020 10:16:48 +0800
From:   Jing Xiangfeng <jingxiangfeng@...wei.com>
To:     <maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
        <tzimmermann@...e.de>, <airlied@...ux.ie>, <daniel@...ll.ch>,
        <sam@...nborg.org>, <andrzej.p@...labora.com>,
        <a.hajda@...sung.com>, <narmstrong@...libre.com>
CC:     <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <jingxiangfeng@...wei.com>
Subject: [PATCH] drm: Add the missed device_unregister() in drm_sysfs_connector_add()

drm_sysfs_connector_add() misses to call device_unregister() when
sysfs_create_link() fails to create. Add the missed function call
to fix it.

Fixes: e1a29c6c5955 ("drm: Add ddc link in sysfs created by drm_connector")
Signed-off-by: Jing Xiangfeng <jingxiangfeng@...wei.com>
---
 drivers/gpu/drm/drm_sysfs.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
index f0336c804639..39e173e10cf7 100644
--- a/drivers/gpu/drm/drm_sysfs.c
+++ b/drivers/gpu/drm/drm_sysfs.c
@@ -274,6 +274,7 @@ static const struct attribute_group *connector_dev_groups[] = {
 int drm_sysfs_connector_add(struct drm_connector *connector)
 {
 	struct drm_device *dev = connector->dev;
+	int ret = 0;
 
 	if (connector->kdev)
 		return 0;
@@ -291,10 +292,16 @@ int drm_sysfs_connector_add(struct drm_connector *connector)
 		return PTR_ERR(connector->kdev);
 	}
 
-	if (connector->ddc)
-		return sysfs_create_link(&connector->kdev->kobj,
+	if (connector->ddc) {
+		ret = sysfs_create_link(&connector->kdev->kobj,
 				 &connector->ddc->dev.kobj, "ddc");
-	return 0;
+		if (ret) {
+			device_unregister(connector->kdev);
+			connector->kdev = NULL;
+		}
+	}
+
+	return ret;
 }
 
 void drm_sysfs_connector_remove(struct drm_connector *connector)
-- 
2.17.1