diff options
Diffstat (limited to 'drivers/counter/counter-sysfs.c')
| -rw-r--r-- | drivers/counter/counter-sysfs.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/counter/counter-sysfs.c b/drivers/counter/counter-sysfs.c index 67a988851657..7cc4d1d523ea 100644 --- a/drivers/counter/counter-sysfs.c +++ b/drivers/counter/counter-sysfs.c @@ -11,6 +11,8 @@ #include <linux/kfifo.h> #include <linux/kstrtox.h> #include <linux/list.h> +#include <linux/mutex.h> +#include <linux/spinlock.h> #include <linux/string.h> #include <linux/sysfs.h> #include <linux/types.h> @@ -796,6 +798,7 @@ static int counter_events_queue_size_write(struct counter_device *counter, { DECLARE_KFIFO_PTR(events, struct counter_event); int err; + unsigned long flags; /* Allocate new events queue */ err = kfifo_alloc(&events, val, GFP_KERNEL); @@ -803,8 +806,12 @@ static int counter_events_queue_size_write(struct counter_device *counter, return err; /* Swap in new events queue */ + mutex_lock(&counter->events_out_lock); + spin_lock_irqsave(&counter->events_in_lock, flags); kfifo_free(&counter->events); counter->events.kfifo = events.kfifo; + spin_unlock_irqrestore(&counter->events_in_lock, flags); + mutex_unlock(&counter->events_out_lock); return 0; } |