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-rw-r--r--drivers/misc/sony-laptop.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/misc/sony-laptop.c b/drivers/misc/sony-laptop.c
index 00e48e2a9c1..60775be2282 100644
--- a/drivers/misc/sony-laptop.c
+++ b/drivers/misc/sony-laptop.c
@@ -46,6 +46,7 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
+#include <linux/smp_lock.h>
#include <linux/types.h>
#include <linux/backlight.h>
#include <linux/platform_device.h>
@@ -1927,8 +1928,10 @@ static int sonypi_misc_release(struct inode *inode, struct file *file)
static int sonypi_misc_open(struct inode *inode, struct file *file)
{
/* Flush input queue on first open */
+ lock_kernel();
if (atomic_inc_return(&sonypi_compat.open_count) == 1)
kfifo_reset(sonypi_compat.fifo);
+ unlock_kernel();
return 0;
}