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-rw-r--r--drivers/char/ppdev.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/char/ppdev.c b/drivers/char/ppdev.c
index 3aab837..f6e6aca 100644
--- a/drivers/char/ppdev.c
+++ b/drivers/char/ppdev.c
@@ -66,6 +66,7 @@
#include <linux/poll.h>
#include <linux/major.h>
#include <linux/ppdev.h>
+#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#define PP_VERSION "ppdev: user-space parallel port driver"
@@ -638,6 +639,7 @@ static int pp_open (struct inode * inode, struct file * file)
unsigned int minor = iminor(inode);
struct pp_struct *pp;
+ cycle_kernel_lock();
if (minor >= PARPORT_MAX)
return -ENXIO;
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