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perf/arm_dmc620: Fix hotplug callback leak in dmc620_pmu_init()

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[ Upstream commit d9f564c966 ]

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 26242b3300 ("bus:
arm-ccn: Prevent hotplug callback leak")

Fixes: 53c218da22 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Shang XiaoJing 2022-11-15 19:55:39 +08:00 committed by Greg Kroah-Hartman
parent 9285b623bb
commit b99fbe8d94
1 changed files with 7 additions and 1 deletions
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8
drivers/perf/arm_dmc620_pmu.c
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@ -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)