diff options
Diffstat (limited to 'drivers/usb/core/file.c')
| -rw-r--r-- | drivers/usb/core/file.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/usb/core/file.c b/drivers/usb/core/file.c index e26bd5e773ad..87ad6b6bfee8 100644 --- a/drivers/usb/core/file.c +++ b/drivers/usb/core/file.c @@ -29,6 +29,7 @@ #define MAX_USB_MINORS 256 static const struct file_operations *usb_minors[MAX_USB_MINORS]; static DECLARE_RWSEM(minor_rwsem); +static DEFINE_MUTEX(init_usb_class_mutex); static int usb_open(struct inode *inode, struct file *file) { @@ -111,8 +112,9 @@ static void release_usb_class(struct kref *kref) static void destroy_usb_class(void) { - if (usb_class) - kref_put(&usb_class->kref, release_usb_class); + mutex_lock(&init_usb_class_mutex); + kref_put(&usb_class->kref, release_usb_class); + mutex_unlock(&init_usb_class_mutex); } int usb_major_init(void) @@ -173,7 +175,10 @@ int usb_register_dev(struct usb_interface *intf, if (intf->minor >= 0) return -EADDRINUSE; + mutex_lock(&init_usb_class_mutex); retval = init_usb_class(); + mutex_unlock(&init_usb_class_mutex); + if (retval) return retval; |