diff options
Diffstat (limited to 'arch/x86/events/core.c')
| -rw-r--r-- | arch/x86/events/core.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c index 5b0dd07b1ef1..acd367c45334 100644 --- a/arch/x86/events/core.c +++ b/arch/x86/events/core.c @@ -2547,6 +2547,7 @@ static ssize_t set_attr_rdpmc(struct device *cdev, struct device_attribute *attr, const char *buf, size_t count) { + static DEFINE_MUTEX(rdpmc_mutex); unsigned long val; ssize_t ret; @@ -2560,6 +2561,8 @@ static ssize_t set_attr_rdpmc(struct device *cdev, if (x86_pmu.attr_rdpmc_broken) return -ENOTSUPP; + guard(mutex)(&rdpmc_mutex); + if (val != x86_pmu.attr_rdpmc) { /* * Changing into or out of never available or always available, |