linux-kernel - [PATCH] drm/panel/raspberrypi-touchscreen: Add check for mipi_dsi_driver

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Message-Id: <20220601021925.2752352-1-jiasheng@iscas.ac.cn>
Date:   Wed,  1 Jun 2022 10:19:25 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     thierry.reding@...il.com, sam@...nborg.org, airlied@...ux.ie,
        daniel@...ll.ch, nsaenz@...nel.org,
        bcm-kernel-feedback-list@...adcom.com
Cc:     dri-devel@...ts.freedesktop.org,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] drm/panel/raspberrypi-touchscreen: 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.

Fixes: 2f733d6194bd ("drm/panel: Add support for the Raspberry Pi 7" Touchscreen.")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
index 145047e19394..cc90afbf4b3e 100644
--- a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
+++ b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
@@ -498,7 +498,12 @@ static struct i2c_driver rpi_touchscreen_driver = {
 
 static int __init rpi_touchscreen_init(void)
 {
-	mipi_dsi_driver_register(&rpi_touchscreen_dsi_driver);
+	int ret;
+
+	ret = mipi_dsi_driver_register(&rpi_touchscreen_dsi_driver);
+	if (ret)
+		return ret;
+
 	return i2c_add_driver(&rpi_touchscreen_driver);
 }
 module_init(rpi_touchscreen_init);
-- 
2.25.1