This is a note to let you know that I've just added the patch titled
perf: arm_dsu: Fix hotplug callback leak in dsu_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-arm_dsu-fix-hotplug-callback-leak-in-dsu_pmu_in.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 dd061ef0c6d9eb7a107b03bd550fc20ad2fab3db
Author: Yuan Can <yuancan@xxxxxxxxxx>
Date: Tue Nov 15 07:02:06 2022 +0000
perf: arm_dsu: Fix hotplug callback leak in dsu_pmu_init()
[ Upstream commit facafab7611f7b872c6b9eeaff53461ef11f482e ]
dsu_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: 7520fa99246d ("perf: ARM DynamIQ Shared Unit PMU support")
Signed-off-by: Yuan Can <yuancan@xxxxxxxxxx>
Acked-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Link: https://lore.kernel.org/r/20221115070207.32634-2-yuancan@xxxxxxxxxx
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/perf/arm_dsu_pmu.c b/drivers/perf/arm_dsu_pmu.c
index 4594e2ed13d5..96e76915da56 100644
--- a/drivers/perf/arm_dsu_pmu.c
+++ b/drivers/perf/arm_dsu_pmu.c
@@ -816,7 +816,11 @@ static int __init dsu_pmu_init(void)
if (ret < 0)
return ret;
dsu_pmu_cpuhp_state = ret;
- return platform_driver_register(&dsu_pmu_driver);
+ ret = platform_driver_register(&dsu_pmu_driver);
+ if (ret)
+ cpuhp_remove_multi_state(dsu_pmu_cpuhp_state);
+
+ return ret;
}
static void __exit dsu_pmu_exit(void)
