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From:   Zhi Song <zhi.song@bytedance.com>
To:     vilhelm.gray@gmail.com, gregkh@linuxfoundation.org,
        rafael@kernel.org
Cc:     linux-kernel@vger.kernel.org, Zhi Song <zhi.song@bytedance.com>
Subject: [PATCH v3] isa: put_device after failing to device_register
Date:   Wed, 15 Jun 2022 23:15:58 +0800
Message-Id: <20220615151558.1766067-1-zhi.song@bytedance.com>
MIME-Version: 1.0
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device_register() is used to register a device with the system.
We need to call put_device() to give up the reference initialized
in device_register() when it returns an error and this will clean
up correctly.

Fixes: a5117ba7da37 ("Driver model: add ISA bus")
Signed-off-by: Zhi Song <zhi.song@bytedance.com>
---
V1 -> V2: Fix up the changelog text correct.
V2 -> V3: Add a fixes tag line specifying the commit where this bug was
introduced.
---
 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