linux-kernel - [PATCH,v2] drm/panel: Fix return value check in nt35950

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Message-ID: <20220317083707.237039-1-luwei32@huawei.com>
Date:   Thu, 17 Mar 2022 16:37:07 +0800
From:   Lu Wei <luwei32@...wei.com>
To:     <thierry.reding@...il.com>, <sam@...nborg.org>, <airlied@...ux.ie>,
        <daniel@...ll.ch>, <marijn.suijten@...ainline.org>,
        <angelogioacchino.delregno@...ainline.org>,
        <dri-devel@...ts.freedesktop.org>
CC:     <linux-kernel@...r.kernel.org>
Subject: [PATCH,v2] drm/panel: Fix return value check in nt35950_probe()

In function nt35950_probe(), mipi_dsi_device_register_full() is called
to create a MIPI DSI device. If it fails, a pointer encoded with an error
will be returned, so use IS_ERR() to check the return value. Besides, use
PTR_ERR to return the actual errno.

Fixes: 623a3531e9cf ("drm/panel: Add driver for Novatek NT35950 DSI DriverIC panels")
Signed-off-by: Lu Wei <luwei32@...wei.com>
---
 drivers/gpu/drm/panel/panel-novatek-nt35950.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-novatek-nt35950.c b/drivers/gpu/drm/panel/panel-novatek-nt35950.c
index 288c7fa83ecc..d252e5e56228 100644
--- a/drivers/gpu/drm/panel/panel-novatek-nt35950.c
+++ b/drivers/gpu/drm/panel/panel-novatek-nt35950.c
@@ -579,9 +579,9 @@ static int nt35950_probe(struct mipi_dsi_device *dsi)
 		}
 
 		nt->dsi[1] = mipi_dsi_device_register_full(dsi_r_host, info);
-		if (!nt->dsi[1]) {
+		if (IS_ERR(nt->dsi[1])) {
 			dev_err(dev, "Cannot get secondary DSI node\n");
-			return -ENODEV;
+			return PTR_ERR(nt->dsi[1]);
 		}
 		num_dsis++;
 	}
-- 
2.17.1