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path: root/drivers/char/cs5535_gpio.c
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Diffstat (limited to 'drivers/char/cs5535_gpio.c')
-rw-r--r--drivers/char/cs5535_gpio.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/char/cs5535_gpio.c b/drivers/char/cs5535_gpio.c
index c0a4a0b..04ba906 100644
--- a/drivers/char/cs5535_gpio.c
+++ b/drivers/char/cs5535_gpio.c
@@ -17,6 +17,7 @@
#include <linux/cdev.h>
#include <linux/ioport.h>
#include <linux/pci.h>
+#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include <asm/io.h>
@@ -157,6 +158,7 @@ static int cs5535_gpio_open(struct inode *inode, struct file *file)
{
u32 m = iminor(inode);
+ cycle_kernel_lock();
/* the mask says which pins are usable by this driver */
if ((mask & (1 << m)) == 0)
return -EINVAL;
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