diff options
| -rw-r--r-- | drivers/usb/core/usb.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c index 2ce3667ec6fa..2f71636af6e1 100644 --- a/drivers/usb/core/usb.c +++ b/drivers/usb/core/usb.c @@ -688,6 +688,10 @@ EXPORT_SYMBOL_GPL(usb_alloc_dev); * Drivers for USB interfaces should normally record such references in * their probe() methods, when they bind to an interface, and release * them by calling usb_put_dev(), in their disconnect() methods. + * However, if a driver does not access the usb_device structure after + * its disconnect() method returns then refcounting is not necessary, + * because the USB core guarantees that a usb_device will not be + * deallocated until after all of its interface drivers have been unbound. * * Return: A pointer to the device with the incremented reference counter. */ @@ -722,6 +726,10 @@ EXPORT_SYMBOL_GPL(usb_put_dev); * Drivers for USB interfaces should normally record such references in * their probe() methods, when they bind to an interface, and release * them by calling usb_put_intf(), in their disconnect() methods. + * However, if a driver does not access the usb_interface structure after + * its disconnect() method returns then refcounting is not necessary, + * because the USB core guarantees that a usb_interface will not be + * deallocated until after its driver has been unbound. * * Return: A pointer to the interface with the incremented reference counter. */ |