diff options
Diffstat (limited to 'drivers/usb/misc/ftdi-elan.c')
| -rw-r--r-- | drivers/usb/misc/ftdi-elan.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/usb/misc/ftdi-elan.c b/drivers/usb/misc/ftdi-elan.c index f21bf5160f8..32c47fbee28 100644 --- a/drivers/usb/misc/ftdi-elan.c +++ b/drivers/usb/misc/ftdi-elan.c @@ -45,6 +45,7 @@ #include <linux/module.h> #include <linux/kref.h> #include <linux/mutex.h> +#include <linux/smp_lock.h> #include <asm/uaccess.h> #include <linux/usb.h> #include <linux/workqueue.h> @@ -623,22 +624,30 @@ static void ftdi_elan_status_work(struct work_struct *work) */ static int ftdi_elan_open(struct inode *inode, struct file *file) { - int subminor = iminor(inode); - struct usb_interface *interface = usb_find_interface(&ftdi_elan_driver, - subminor); + int subminor; + struct usb_interface *interface; + + lock_kernel(); + subminor = iminor(inode); + interface = usb_find_interface(&ftdi_elan_driver, subminor); + if (!interface) { + unlock_kernel(); printk(KERN_ERR "can't find device for minor %d\n", subminor); return -ENODEV; } else { struct usb_ftdi *ftdi = usb_get_intfdata(interface); if (!ftdi) { + unlock_kernel(); return -ENODEV; } else { if (down_interruptible(&ftdi->sw_lock)) { + unlock_kernel(); return -EINTR; } else { ftdi_elan_get_kref(ftdi); file->private_data = ftdi; + unlock_kernel(); return 0; } } |