Commit 2abcc023 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Greg Kroah-Hartman

perf/x86/intel/cstate: Prevent hotplug callback leak

commit 834fcd29 upstream.

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: 77c34ef1 ("perf/x86/intel/cstate: Convert Intel CSTATE to hotplug state machine")
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7b9e1a16
......@@ -571,6 +571,9 @@ 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);
......@@ -583,16 +586,16 @@ 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;
}
}
......@@ -606,8 +609,7 @@ static int __init cstate_init(void)
return err;
}
}
return err;
return 0;
}
static int __init cstate_pmu_init(void)
......@@ -632,8 +634,6 @@ 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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