linux-kernel - [PATCH v2] drm: bridge: adv7511: Add check for mipi_dsi_driver

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Date:   Thu,  2 Jun 2022 18:34:01 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     laurent.pinchart@...asonboard.com
Cc:     andrzej.hajda@...el.com, narmstrong@...libre.com,
        robert.foss@...aro.org, jonas@...boo.se, jernej.skrabec@...il.com,
        airlied@...ux.ie, daniel@...ll.ch, maxime@...no.tech,
        sam@...nborg.org, alsi@...g-olufsen.dk, jagan@...rulasolutions.com,
        biju.das.jz@...renesas.com, l.stach@...gutronix.de,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH v2] drm: bridge: adv7511: Add check for mipi_dsi_driver_register

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>
---
Changelog:

v1 -> v2

*Change 1. Add the mipi_dsi_driver_unregister if i2c_add_driver fails.
---
 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 5bb9300040dd..2275d15d4a8b 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
@@ -1392,10 +1392,21 @@ 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);
 
-- 
2.25.1