From d9f564c966e63925aac4ba273a9319d7fb6f4b4e Mon Sep 17 00:00:00 2001
From: Shang XiaoJing <shangxiaojing@huawei.com>
Date: Tue, 15 Nov 2022 19:55:39 +0800
Subject: [PATCH] perf/arm_dmc620: Fix hotplug callback leak in
dmc620_pmu_init()
dmc620_pmu_init() won't remove the callback added by
cpuhp_setup_state_multi() when platform_driver_register() failed. Remove
the callback by cpuhp_remove_multi_state() in fail path.
Similar to the handling of arm_ccn_init() in commit 26242b330093 ("bus:
arm-ccn: Prevent hotplug callback leak")
Fixes: 53c218da220c ("driver/perf: Add PMU driver for the ARM DMC-620 memory controller")
Signed-off-by: Shang XiaoJing <shangxiaojing@huawei.com>
Reviewed-by: Punit Agrawal <punit.agrawal@bytedance.com>
Link: https://lore.kernel.org/r/20221115115540.6245-2-shangxiaojing@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
---
drivers/perf/arm_dmc620_pmu.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/perf/arm_dmc620_pmu.c b/drivers/perf/arm_dmc620_pmu.c
index 280a6ae3e27cf..54aa4658fb36e 100644
--- a/drivers/perf/arm_dmc620_pmu.c
+++ b/drivers/perf/arm_dmc620_pmu.c
@@ -725,6 +725,8 @@ static struct platform_driver dmc620_pmu_driver = {
static int __init dmc620_pmu_init(void)
{
+ int ret;
+
cpuhp_state_num = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
DMC620_DRVNAME,
NULL,
@@ -732,7 +734,11 @@ static int __init dmc620_pmu_init(void)
if (cpuhp_state_num < 0)
return cpuhp_state_num;
- return platform_driver_register(&dmc620_pmu_driver);
+ ret = platform_driver_register(&dmc620_pmu_driver);
+ if (ret)
+ cpuhp_remove_multi_state(cpuhp_state_num);
+
+ return ret;
}
static void __exit dmc620_pmu_exit(void)