diff options
Diffstat (limited to 'drivers/usb/usb-skeleton.c')
| -rw-r--r-- | drivers/usb/usb-skeleton.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/usb-skeleton.c b/drivers/usb/usb-skeleton.c index 61522787f39c..e94176bfd272 100644 --- a/drivers/usb/usb-skeleton.c +++ b/drivers/usb/usb-skeleton.c @@ -18,6 +18,7 @@ #include <linux/slab.h> #include <linux/module.h> #include <linux/kref.h> +#include <linux/smp_lock.h> #include <linux/uaccess.h> #include <linux/usb.h> #include <linux/mutex.h> @@ -90,6 +91,7 @@ static int skel_open(struct inode *inode, struct file *file) int subminor; int retval = 0; + lock_kernel(); subminor = iminor(inode); interface = usb_find_interface(&skel_driver, subminor); @@ -135,6 +137,7 @@ static int skel_open(struct inode *inode, struct file *file) mutex_unlock(&dev->io_mutex); exit: + unlock_kernel(); return retval; } |