diff options
Diffstat (limited to 'drivers/usb/misc/ldusb.c')
| -rw-r--r-- | drivers/usb/misc/ldusb.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/usb/misc/ldusb.c b/drivers/usb/misc/ldusb.c index 7c0bd13eccb2..8de32df5978a 100644 --- a/drivers/usb/misc/ldusb.c +++ b/drivers/usb/misc/ldusb.c @@ -33,6 +33,7 @@ #include <linux/slab.h> #include <linux/module.h> #include <linux/mutex.h> +#include <linux/smp_lock.h> #include <asm/uaccess.h> #include <linux/input.h> @@ -296,12 +297,14 @@ static int ld_usb_open(struct inode *inode, struct file *file) int retval; struct usb_interface *interface; + lock_kernel(); nonseekable_open(inode, file); subminor = iminor(inode); interface = usb_find_interface(&ld_usb_driver, subminor); if (!interface) { + unlock_kernel(); err("%s - error, can't find device for minor %d\n", __func__, subminor); return -ENODEV; @@ -309,12 +312,16 @@ static int ld_usb_open(struct inode *inode, struct file *file) dev = usb_get_intfdata(interface); - if (!dev) + if (!dev) { + unlock_kernel(); return -ENODEV; + } /* lock this device */ - if (mutex_lock_interruptible(&dev->mutex)) + if (mutex_lock_interruptible(&dev->mutex)) { + unlock_kernel(); return -ERESTARTSYS; + } /* allow opening only once */ if (dev->open_count) { @@ -353,6 +360,7 @@ static int ld_usb_open(struct inode *inode, struct file *file) unlock_exit: mutex_unlock(&dev->mutex); + unlock_kernel(); return retval; } |