diff options
Diffstat (limited to 'drivers/char/scx200_gpio.c')
| -rw-r--r-- | drivers/char/scx200_gpio.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/char/scx200_gpio.c b/drivers/char/scx200_gpio.c index 99e5272e3c53..1d9100561c8a 100644 --- a/drivers/char/scx200_gpio.c +++ b/drivers/char/scx200_gpio.c @@ -12,6 +12,7 @@ #include <linux/kernel.h> #include <linux/init.h> #include <linux/platform_device.h> +#include <linux/smp_lock.h> #include <asm/uaccess.h> #include <asm/io.h> @@ -51,6 +52,7 @@ static int scx200_gpio_open(struct inode *inode, struct file *file) unsigned m = iminor(inode); file->private_data = &scx200_gpio_ops; + cycle_kernel_lock(); if (m >= MAX_PINS) return -EINVAL; return nonseekable_open(inode, file); |