diff options
Diffstat (limited to 'arch/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/perf_cpum_cf.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/arch/s390/kernel/perf_cpum_cf.c b/arch/s390/kernel/perf_cpum_cf.c index 28fa80fd69fa..e58e49488ad9 100644 --- a/arch/s390/kernel/perf_cpum_cf.c +++ b/arch/s390/kernel/perf_cpum_cf.c @@ -397,12 +397,10 @@ static DEFINE_MUTEX(pmc_reserve_mutex); /* Release the PMU if event is the last perf event */ static void hw_perf_event_destroy(struct perf_event *event) { - if (!atomic_add_unless(&num_events, -1, 1)) { - mutex_lock(&pmc_reserve_mutex); - if (atomic_dec_return(&num_events) == 0) - __kernel_cpumcf_end(); - mutex_unlock(&pmc_reserve_mutex); - } + mutex_lock(&pmc_reserve_mutex); + if (atomic_dec_return(&num_events) == 0) + __kernel_cpumcf_end(); + mutex_unlock(&pmc_reserve_mutex); } /* CPUMF <-> perf event mappings for kernel+userspace (basic set) */ |