[PATCH v2] drm: bridge: adv7511: Add check for mipi_dsi_driver_register

[Jiasheng Jiang]

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 <jiash...@iscas.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