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

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Date:   Mon, 18 Apr 2022 10:57:55 +0000
From:   cgel.zte@...il.com
To:     kashyap.desai@...adcom.com, sumit.saxena@...adcom.com
Cc:     shivasharan.srikanteshwara@...adcom.com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, megaraidlinux.pdl@...adcom.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lv Ruyi <lv.ruyi@....com.cn>, Zeal Robot <zealci@....com.cn>
Subject: [PATCH] megaraid: 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/scsi/megaraid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/megaraid.c b/drivers/scsi/megaraid.c
index a5d8cee2d510..bf491af9f0d6 100644
--- a/drivers/scsi/megaraid.c
+++ b/drivers/scsi/megaraid.c
@@ -4607,7 +4607,7 @@ static int __init megaraid_init(void)
 	 * major number allocation.
 	 */
 	major = register_chrdev(0, "megadev_legacy", &megadev_fops);
-	if (!major) {
+	if (major < 0) {
 		printk(KERN_WARNING
 				"megaraid: failed to register char device\n");
 	}
-- 
2.25.1