diff options
Diffstat (limited to 'drivers/usb/misc/idmouse.c')
| -rw-r--r-- | drivers/usb/misc/idmouse.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/usb/misc/idmouse.c b/drivers/usb/misc/idmouse.c index a54c3cb804ce..68df9ac76699 100644 --- a/drivers/usb/misc/idmouse.c +++ b/drivers/usb/misc/idmouse.c @@ -24,6 +24,7 @@ #include <linux/module.h> #include <linux/completion.h> #include <linux/mutex.h> +#include <linux/smp_lock.h> #include <asm/uaccess.h> #include <linux/usb.h> @@ -226,16 +227,20 @@ static int idmouse_open(struct inode *inode, struct file *file) struct usb_interface *interface; int result; + lock_kernel(); /* get the interface from minor number and driver information */ interface = usb_find_interface (&idmouse_driver, iminor (inode)); - if (!interface) + if (!interface) { + unlock_kernel(); return -ENODEV; + } mutex_lock(&open_disc_mutex); /* get the device information block from the interface */ dev = usb_get_intfdata(interface); if (!dev) { mutex_unlock(&open_disc_mutex); + unlock_kernel(); return -ENODEV; } @@ -272,6 +277,7 @@ error: /* unlock this device */ mutex_unlock(&dev->lock); + unlock_kernel(); return result; } |