ARM: perf: return NOTIFY_DONE from cpu notifier when no available PMU

When attempting to reset the PMU state for either a NULL PMU or a PMU
implementation without a reset function, return NOTIFY_DONE from the CPU
notifier as we don't care about the hotplug event.

Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/arch/arm/kernel/perf_event_cpu.c b/arch/arm/kernel/perf_event_cpu.c
index 71c824c..db9c6b5 100644 (file)
--- a/arch/arm/kernel/perf_event_cpu.c
+++ b/arch/arm/kernel/perf_event_cpu.c
@@ -165,6 +165,8 @@ static int __cpuinit cpu_pmu_notify(struct notifier_block *b,
 
        if (cpu_pmu && cpu_pmu->reset)
                cpu_pmu->reset(cpu_pmu);
+       else
+               return NOTIFY_DONE;
 
        return NOTIFY_OK;
 }