linux-kernel - [PATCH] PNP: add a put_device() in isapnp

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Message-Id: <20251218083646.553049-1-lihaoxiang@isrc.iscas.ac.cn>
Date: Thu, 18 Dec 2025 16:36:46 +0800
From: Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>
To: perex@...ex.cz,
	rafael@...nel.org
Cc: linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>,
	stable@...r.kernel.org
Subject: [PATCH] PNP: add a put_device() in isapnp_init()

if pnp_register_protocol() fails, call put_device()
to drop the device reference.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@...r.kernel.org
Signed-off-by: Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>
---
 drivers/pnp/isapnp/core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pnp/isapnp/core.c b/drivers/pnp/isapnp/core.c
index 219f96f2aaaf..d6daab7ed59e 100644
--- a/drivers/pnp/isapnp/core.c
+++ b/drivers/pnp/isapnp/core.c
@@ -983,8 +983,10 @@ static int __init isapnp_init(void)
 		return -EBUSY;
 	}
 
-	if (pnp_register_protocol(&isapnp_protocol) < 0)
+	if (pnp_register_protocol(&isapnp_protocol) < 0) {
+		put_device(&isapnp_protocol.dev);
 		return -EBUSY;
+	}
 
 	/*
 	 *      Print a message. The existing ISAPnP code is hanging machines
-- 
2.25.1