linux-kernel - [PATCH] isa: put_device after failing to device

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Message-Id: <20220614145757.1734996-1-zhi.song@bytedance.com>
Date:   Tue, 14 Jun 2022 22:57:57 +0800
From:   Zhi Song <zhi.song@...edance.com>
To:     vilhelm.gray@...il.com, gregkh@...uxfoundation.org,
        rafael@...nel.org
Cc:     linux-kernel@...r.kernel.org, Zhi Song <zhi.song@...edance.com>
Subject: [PATCH] isa: put_device after failing to device_register

device_register() is used to register a device with the system.

We cannot directly free dev after calling this function,
even if it returns an error.

We should use put_device() to give up the reference
initialized in this function instead.

Signed-off-by: Zhi Song <zhi.song@...edance.com>
---
 drivers/base/isa.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/base/isa.c b/drivers/base/isa.c
index 55e3ee2da98f..cf88f3d77b7d 100644
--- a/drivers/base/isa.c
+++ b/drivers/base/isa.c
@@ -173,8 +173,10 @@ static int __init isa_bus_init(void)
 	error = bus_register(&isa_bus_type);
 	if (!error) {
 		error = device_register(&isa_bus);
-		if (error)
+		if (error) {
+			put_device(&isa_bus);
 			bus_unregister(&isa_bus_type);
+		}
 	}
 	return error;
 }
-- 
2.30.2