linux-kernel - [PATCH 4.19 076/287] drm: bridge: adv7511: Add check for mipi_dsi_driver

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Message-Id: <20220823080102.793431805@linuxfoundation.org>
Date:   Tue, 23 Aug 2022 10:24:05 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 076/287] drm: bridge: adv7511: Add check for mipi_dsi_driver_register

From: Jiasheng Jiang <jiasheng@...as.ac.cn>

[ Upstream commit 831463667b5f4f1e5bce9c3b94e9e794d2bc8923 ]

As mipi_dsi_driver_register could return error if fails,
it should be better to check the return value and return error
if fails.
Moreover, if i2c_add_driver fails,  mipi_dsi_driver_register
should be reverted.

Fixes: 1e4d58cd7f88 ("drm/bridge: adv7533: Create a MIPI DSI device")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Sam Ravnborg <sam@...nborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220602103401.2980938-1-jiasheng@iscas.ac.cn
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
index b6e7cc9082ca..31b75d3ca6e9 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
@@ -1301,10 +1301,21 @@ static struct i2c_driver adv7511_driver = {
 
 static int __init adv7511_init(void)
 {
-	if (IS_ENABLED(CONFIG_DRM_MIPI_DSI))
-		mipi_dsi_driver_register(&adv7533_dsi_driver);
+	int ret;
+
+	if (IS_ENABLED(CONFIG_DRM_MIPI_DSI)) {
+		ret = mipi_dsi_driver_register(&adv7533_dsi_driver);
+		if (ret)
+			return ret;
+	}
 
-	return i2c_add_driver(&adv7511_driver);
+	ret = i2c_add_driver(&adv7511_driver);
+	if (ret) {
+		if (IS_ENABLED(CONFIG_DRM_MIPI_DSI))
+			mipi_dsi_driver_unregister(&adv7533_dsi_driver);
+	}
+
+	return ret;
 }
 module_init(adv7511_init);
 
-- 
2.35.1