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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Kefeng Wang <wangkefeng.wang@huawei.com>,
        Hulk Robot <hulkci@huawei.com>,
        Corey Minyard <cminyard@mvista.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 5.1 005/141] ipmi_si: fix unexpected driver unregister warning
Date:   Fri, 19 Jul 2019 00:00:30 -0400
Message-Id: <20190719040246.15945-5-sashal@kernel.org>
In-Reply-To: <20190719040246.15945-1-sashal@kernel.org>
References: <20190719040246.15945-1-sashal@kernel.org>
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Sender: linux-kernel-owner@vger.kernel.org
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From: Kefeng Wang <wangkefeng.wang@huawei.com>

[ Upstream commit 2f66353963043e1d8dfacfbdf509acc5d3be7698 ]

If ipmi_si_platform_init()->platform_driver_register() fails,
platform_driver_unregister() called unconditionally will trigger
following warning,

ipmi_platform: Unable to register driver: -12
------------[ cut here ]------------
Unexpected driver unregister!
WARNING: CPU: 1 PID: 7210 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@huawei.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Message-Id: <20190517101245.4341-1-wangkefeng.wang@huawei.com>

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/char/ipmi/ipmi_si_platform.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/char/ipmi/ipmi_si_platform.c b/drivers/char/ipmi/ipmi_si_platform.c
index 54c7ded2a1ff..859c78de1d4a 100644
--- a/drivers/char/ipmi/ipmi_si_platform.c
+++ b/drivers/char/ipmi/ipmi_si_platform.c
@@ -19,6 +19,7 @@
 #include "ipmi_si.h"
 #include "ipmi_dmi.h"
 
+static bool platform_registered;
 static bool si_tryplatform = true;
 #ifdef CONFIG_ACPI
 static bool          si_tryacpi = true;
@@ -471,9 +472,12 @@ void ipmi_si_platform_init(void)
 	int rv = platform_driver_register(&ipmi_platform_driver);
 	if (rv)
 		pr_err("Unable to register driver: %d\n", rv);
+	else
+		platform_registered = true;
 }
 
 void ipmi_si_platform_shutdown(void)
 {
-	platform_driver_unregister(&ipmi_platform_driver);
+	if (platform_registered)
+		platform_driver_unregister(&ipmi_platform_driver);
 }
-- 
2.20.1