linux-kernel - [PATCH 5.2 019/215] ipmi_ssif: fix unexpected driver unregister warning

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Message-Id: <20190729190743.029001920@linuxfoundation.org>
Date:   Mon, 29 Jul 2019 21:20:15 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hulk Robot <hulkci@...wei.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Corey Minyard <cminyard@...sta.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.2 019/215] ipmi_ssif: fix unexpected driver unregister warning

[ Upstream commit 2cd0e54489e65b8e22124a8b053aff40815487f7 ]

If platform_driver_register() fails from init_ipmi_ssif(),
platform_driver_unregister() called unconditionally will
trigger following warning,

ipmi_ssif: Unable to register driver: -12
------------[ cut here ]------------
Unexpected driver unregister!
WARNING: CPU: 1 PID: 6305 at drivers/base/driver.c:193 driver_unregister+0x60/0x70 drivers/base/driver.c:193

Fix it by adding platform_registered variable, only unregister platform
driver when it is already successfully registered.

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
Message-Id: <20190524143724.43218-1-wangkefeng.wang@...wei.com>

Signed-off-by: Corey Minyard <cminyard@...sta.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/char/ipmi/ipmi_ssif.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/char/ipmi/ipmi_ssif.c b/drivers/char/ipmi/ipmi_ssif.c
index cf8156d6bc07..305fa5054274 100644
--- a/drivers/char/ipmi/ipmi_ssif.c
+++ b/drivers/char/ipmi/ipmi_ssif.c
@@ -303,6 +303,7 @@ struct ssif_info {
 	((unsigned int) atomic_read(&(ssif)->stats[SSIF_STAT_ ## stat]))
 
 static bool initialized;
+static bool platform_registered;
 
 static void return_hosed_msg(struct ssif_info *ssif_info,
 			     struct ipmi_smi_msg *msg);
@@ -2088,6 +2089,8 @@ static int init_ipmi_ssif(void)
 		rv = platform_driver_register(&ipmi_driver);
 		if (rv)
 			pr_err("Unable to register driver: %d\n", rv);
+		else
+			platform_registered = true;
 	}
 
 	ssif_i2c_driver.address_list = ssif_address_list();
@@ -2111,7 +2114,7 @@ static void cleanup_ipmi_ssif(void)
 
 	kfree(ssif_i2c_driver.address_list);
 
-	if (ssif_trydmi)
+	if (ssif_trydmi && platform_registered)
 		platform_driver_unregister(&ipmi_driver);
 
 	free_ssif_clients();
-- 
2.20.1