Commit-ID: 5a8b5de2e90f6b1410390b14f92aa7b6b2a59ad7
Gitweb: http://git.kernel.org/tip/5a8b5de2e90f6b1410390b14f92aa7b6b2a59ad7
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Thu, 22 Dec 2016 11:02:08 +0100
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Thu, 22 Dec 2016 11:37:53 +0100
perf/x86/intel/cstate: Prevent hotplug callback leak
If the pmu registration fails the registered hotplug callbacks are not
removed. Wrong in any case, but fatal in case of a modular driver.
Replace the nonsensical state names with proper ones while at it.
Fixes: 77c34ef1c319 ("perf/x86/intel/cstate: Convert Intel CSTATE to hotplug state machine")
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Sebastian Siewior <bigeasy@xxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
arch/x86/events/intel/cstate.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/arch/x86/events/intel/cstate.c b/arch/x86/events/intel/cstate.c
index da51e5a..fec8a46 100644
--- a/arch/x86/events/intel/cstate.c
+++ b/arch/x86/events/intel/cstate.c
@@ -594,6 +594,9 @@ static int __init cstate_probe(const struct cstate_model *cm)
static inline void cstate_cleanup(void)
{
+ cpuhp_remove_state_nocalls(CPUHP_AP_PERF_X86_CSTATE_ONLINE);
+ cpuhp_remove_state_nocalls(CPUHP_AP_PERF_X86_CSTATE_STARTING);
+
if (has_cstate_core)
perf_pmu_unregister(&cstate_core_pmu);
@@ -606,16 +609,16 @@ static int __init cstate_init(void)
int err;
cpuhp_setup_state(CPUHP_AP_PERF_X86_CSTATE_STARTING,
- "AP_PERF_X86_CSTATE_STARTING", cstate_cpu_init,
- NULL);
+ "perf/x86/cstate:starting", cstate_cpu_init, NULL);
cpuhp_setup_state(CPUHP_AP_PERF_X86_CSTATE_ONLINE,
- "AP_PERF_X86_CSTATE_ONLINE", NULL, cstate_cpu_exit);
+ "perf/x86/cstate:online", NULL, cstate_cpu_exit);
if (has_cstate_core) {
err = perf_pmu_register(&cstate_core_pmu, cstate_core_pmu.name, -1);
if (err) {
has_cstate_core = false;
pr_info("Failed to register cstate core pmu\n");
+ cstate_cleanup();
return err;
}
}
@@ -629,8 +632,7 @@ static int __init cstate_init(void)
return err;
}
}
-
- return err;
+ return 0;
}
static int __init cstate_pmu_init(void)
@@ -655,8 +657,6 @@ module_init(cstate_pmu_init);
static void __exit cstate_pmu_exit(void)
{
- cpuhp_remove_state_nocalls(CPUHP_AP_PERF_X86_CSTATE_ONLINE);
- cpuhp_remove_state_nocalls(CPUHP_AP_PERF_X86_CSTATE_STARTING);
cstate_cleanup();
}
module_exit(cstate_pmu_exit);
--
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