From: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
[ 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@xxxxxxxxxx>
Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Message-Id: <20190524143724.43218-1-wangkefeng.wang@xxxxxxxxxx>
Signed-off-by: Corey Minyard <cminyard@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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
