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 f2a91c4d8cab..0cd849675d99 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; @@ -469,9 +470,12 @@ 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); }