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authorRobin Murphy <robin.murphy@arm.com>2021-12-03 14:44:50 +0300
committerWill Deacon <will@kernel.org>2021-12-14 15:09:27 +0300
commit56c7c6eaf3eb8ac1ec40d56096c0f2b27250da5f (patch)
tree72af50c25ba36c18f9505c6f8bd10426d91eefdc /drivers/perf
parentd58071a8a76d779eedab38033ae4c821c30295a5 (diff)
downloadlinux-56c7c6eaf3eb8ac1ec40d56096c0f2b27250da5f.tar.xz
perf/arm-cmn: Fix CPU hotplug unregistration
Attempting to migrate the PMU context after we've unregistered the PMU device, or especially if we never successfully registered it in the first place, is a woefully bad idea. It's also fundamentally pointless anyway. Make sure to unregister an instance from the hotplug handler *without* invoking the teardown callback. Fixes: 0ba64770a2f2 ("perf: Add Arm CMN-600 PMU driver") Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/2c221d745544774e4b07583b65b5d4d94f7e0fe4.1638530442.git.robin.murphy@arm.com Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/perf')
-rw-r--r--drivers/perf/arm-cmn.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
index bc3cba5f8c5d..400eb7f579dc 100644
--- a/drivers/perf/arm-cmn.c
+++ b/drivers/perf/arm-cmn.c
@@ -1561,7 +1561,8 @@ static int arm_cmn_probe(struct platform_device *pdev)
err = perf_pmu_register(&cmn->pmu, name, -1);
if (err)
- cpuhp_state_remove_instance(arm_cmn_hp_state, &cmn->cpuhp_node);
+ cpuhp_state_remove_instance_nocalls(arm_cmn_hp_state, &cmn->cpuhp_node);
+
return err;
}
@@ -1572,7 +1573,7 @@ static int arm_cmn_remove(struct platform_device *pdev)
writel_relaxed(0, cmn->dtc[0].base + CMN_DT_DTC_CTL);
perf_pmu_unregister(&cmn->pmu);
- cpuhp_state_remove_instance(arm_cmn_hp_state, &cmn->cpuhp_node);
+ cpuhp_state_remove_instance_nocalls(arm_cmn_hp_state, &cmn->cpuhp_node);
return 0;
}