diff options
Diffstat (limited to 'drivers/usb/misc/vstusb.c')
| -rw-r--r-- | drivers/usb/misc/vstusb.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/usb/misc/vstusb.c b/drivers/usb/misc/vstusb.c index 874c81b..b787b25 100644 --- a/drivers/usb/misc/vstusb.c +++ b/drivers/usb/misc/vstusb.c @@ -27,6 +27,7 @@ #include <linux/slab.h> #include <linux/module.h> #include <linux/mutex.h> +#include <linux/smp_lock.h> #include <linux/uaccess.h> #include <linux/usb.h> @@ -103,19 +104,23 @@ static int vstusb_open(struct inode *inode, struct file *file) struct vstusb_device *vstdev; struct usb_interface *interface; + lock_kernel(); interface = usb_find_interface(&vstusb_driver, iminor(inode)); if (!interface) { printk(KERN_ERR KBUILD_MODNAME ": %s - error, can't find device for minor %d\n", __func__, iminor(inode)); + unlock_kernel(); return -ENODEV; } vstdev = usb_get_intfdata(interface); - if (!vstdev) + if (!vstdev) { + unlock_kernel(); return -ENODEV; + } /* lock this device */ mutex_lock(&vstdev->lock); @@ -123,6 +128,7 @@ static int vstusb_open(struct inode *inode, struct file *file) /* can only open one time */ if ((!vstdev->present) || (vstdev->isopen)) { mutex_unlock(&vstdev->lock); + unlock_kernel(); return -EBUSY; } @@ -137,6 +143,7 @@ static int vstusb_open(struct inode *inode, struct file *file) dev_dbg(&vstdev->usb_dev->dev, "%s: opened\n", __func__); mutex_unlock(&vstdev->lock); + unlock_kernel(); return 0; } |
