[PATCH 4.8 04/96] perf/x86/intel/cstate: Prevent hotplug callback leak

[Greg Kroah-Hartman]

4.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Thomas Gleixner <t...@linutronix.de>

commit 834fcd298003c10ce450e66960c78893cb1cc4b5 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: 77c34ef1c319 ("perf/x86/intel/cstate: Convert Intel CSTATE to hotplug 
state machine")
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Cc: Sebastian Siewior <bige...@linutronix.de>
Cc: Peter Zijlstra <pet...@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 arch/x86/events/intel/cstate.c |   14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

--- a/arch/x86/events/intel/cstate.c
+++ b/arch/x86/events/intel/cstate.c
@@ -571,6 +571,9 @@ static int __init cstate_probe(const str
 
 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);