linux-kernel - [PATCH] net: cosa: fix error check return value of register

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Message-Id: <20220418105834.2558892-1-lv.ruyi@zte.com.cn>
Date:   Mon, 18 Apr 2022 10:58:34 +0000
From:   cgel.zte@...il.com
To:     kas@...muni.cz, davem@...emloft.net
Cc:     kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Lv Ruyi <lv.ruyi@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH] net: cosa: fix error check return value of register_chrdev()

From: Lv Ruyi <lv.ruyi@....com.cn>

If major equal 0, register_chrdev() returns error code when it fails.
This function dynamically allocate a major and return its number on
success, so we should use "< 0" to check it instead of "!".

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@....com.cn>
---
 drivers/net/wan/cosa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wan/cosa.c b/drivers/net/wan/cosa.c
index 23d2954d9747..1e5672019922 100644
--- a/drivers/net/wan/cosa.c
+++ b/drivers/net/wan/cosa.c
@@ -349,7 +349,7 @@ static int __init cosa_init(void)
 		}
 	} else {
 		cosa_major = register_chrdev(0, "cosa", &cosa_fops);
-		if (!cosa_major) {
+		if (cosa_major < 0) {
 			pr_warn("unable to register chardev\n");
 			err = -EIO;
 			goto out;
-- 
2.25.1