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| author | Shang XiaoJing <shangxiaojing@huawei.com> | 2022-11-15 19:55:40 +0800 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2022-11-15 13:47:04 +0000 |
| commit | 6f2d566b46436a50a80d6445e82879686b89588c (patch) | |
| tree | 781a13221e54285dfd5a1fb89b433a98b5863007 /drivers/perf/arm_smmuv3_pmu.c | |
| parent | d9f564c966e63925aac4ba273a9319d7fb6f4b4e (diff) | |
| download | linux-6f2d566b46436a50a80d6445e82879686b89588c.tar.gz linux-6f2d566b46436a50a80d6445e82879686b89588c.tar.bz2 linux-6f2d566b46436a50a80d6445e82879686b89588c.zip | |
perf/smmuv3: Fix hotplug callback leak in arm_smmu_pmu_init()
arm_smmu_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: 7d839b4b9e00 ("perf/smmuv3: Add arm64 smmuv3 pmu driver")
Signed-off-by: Shang XiaoJing <shangxiaojing@huawei.com>
Reviewed-by: Punit Agrawal <punit.agrawal@bytedance.com>
Link: https://lore.kernel.org/r/20221115115540.6245-3-shangxiaojing@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/perf/arm_smmuv3_pmu.c')
| -rw-r--r-- | drivers/perf/arm_smmuv3_pmu.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/perf/arm_smmuv3_pmu.c b/drivers/perf/arm_smmuv3_pmu.c index 00d4c45a8017..25a269d431e4 100644 --- a/drivers/perf/arm_smmuv3_pmu.c +++ b/drivers/perf/arm_smmuv3_pmu.c @@ -959,6 +959,8 @@ static struct platform_driver smmu_pmu_driver = { static int __init arm_smmu_pmu_init(void) { + int ret; + cpuhp_state_num = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "perf/arm/pmcg:online", NULL, @@ -966,7 +968,11 @@ static int __init arm_smmu_pmu_init(void) if (cpuhp_state_num < 0) return cpuhp_state_num; - return platform_driver_register(&smmu_pmu_driver); + ret = platform_driver_register(&smmu_pmu_driver); + if (ret) + cpuhp_remove_multi_state(cpuhp_state_num); + + return ret; } module_init(arm_smmu_pmu_init); |