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path: root/drivers/char/scx200_gpio.c
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Diffstat (limited to 'drivers/char/scx200_gpio.c')
-rw-r--r--drivers/char/scx200_gpio.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/char/scx200_gpio.c b/drivers/char/scx200_gpio.c
index be2c623a986..1d9100561c8 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>
@@ -46,12 +47,12 @@ struct nsc_gpio_ops scx200_gpio_ops = {
};
EXPORT_SYMBOL_GPL(scx200_gpio_ops);
-/* No BKL needed here: no global resources used */
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);