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path: root/drivers/char/lcd.c
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Diffstat (limited to 'drivers/char/lcd.c')
-rw-r--r--drivers/char/lcd.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/char/lcd.c b/drivers/char/lcd.c
index 4fe9206f84de..1c29b20e4f4c 100644
--- a/drivers/char/lcd.c
+++ b/drivers/char/lcd.c
@@ -20,6 +20,7 @@
#include <linux/mc146818rtc.h>
#include <linux/netdevice.h>
#include <linux/sched.h>
+#include <linux/smp_lock.h>
#include <linux/delay.h>
#include <asm/io.h>
@@ -414,6 +415,8 @@ static int lcd_ioctl(struct inode *inode, struct file *file,
static int lcd_open(struct inode *inode, struct file *file)
{
+ cycle_kernel_lock();
+
if (!lcd_present)
return -ENXIO;
else