This is a note to let you know that I've just added the patch titled
perf/smmuv3: Fix hotplug callback leak in arm_smmu_pmu_init()
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
perf-smmuv3-fix-hotplug-callback-leak-in-arm_smmu_pm.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 4dadeda0a7a60eab85f65cb238a0c8d7adbf1276
Author: Shang XiaoJing <shangxiaojing@xxxxxxxxxx>
Date: Tue Nov 15 19:55:40 2022 +0800
perf/smmuv3: Fix hotplug callback leak in arm_smmu_pmu_init()
[ Upstream commit 6f2d566b46436a50a80d6445e82879686b89588c ]
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@xxxxxxxxxx>
Reviewed-by: Punit Agrawal <punit.agrawal@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20221115115540.6245-3-shangxiaojing@xxxxxxxxxx
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/perf/arm_smmuv3_pmu.c b/drivers/perf/arm_smmuv3_pmu.c
index 6a3fa1f69e68..0b6af7719641 100644
--- a/drivers/perf/arm_smmuv3_pmu.c
+++ b/drivers/perf/arm_smmuv3_pmu.c
@@ -872,6 +872,8 @@ 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,
@@ -879,7 +881,11 @@ 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);
