1 files changed, 6 insertions, 14 deletions

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 9757b96f15f5..b68c4fb7a944 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -983,14 +983,8 @@ static int x86_pmu_start(struct perf_event *event)
 
 static void x86_pmu_unthrottle(struct perf_event *event)
 {
-        struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
-        struct hw_perf_event *hwc = &event->hw;
-
-        if (WARN_ON_ONCE(hwc->idx >= X86_PMC_IDX_MAX ||
-                                cpuc->events[hwc->idx] != event))
-                return;
-
-        x86_pmu.enable(event);
+        int ret = x86_pmu_start(event);
+        WARN_ON_ONCE(ret);
 }
 
 void perf_event_print_debug(void)
@@ -1050,11 +1044,9 @@ static void x86_pmu_stop(struct perf_event *event)
         struct hw_perf_event *hwc = &event->hw;
         int idx = hwc->idx;
 
-        /*
-         * Must be done before we disable, otherwise the nmi handler
-         * could reenable again:
-         */
-        __clear_bit(idx, cpuc->active_mask);
+        if (!__test_and_clear_bit(idx, cpuc->active_mask))
+                return;
+
         x86_pmu.disable(event);
 
         /*
@@ -1123,7 +1115,7 @@ static int x86_pmu_handle_irq(struct pt_regs *regs)
                         continue;
 
                 if (perf_event_overflow(event, 1, &data, regs))
-                        x86_pmu.disable(event);
+                        x86_pmu_stop(event);
         }
 
         if (handled)