usb_autopm_put_interface_async (9) - Linux Man Pages
usb_autopm_put_interface_async: decrement a USB interface's PM-usage counter
usb_autopm_put_interface_async - decrement a USB interface's PM-usage counter
void usb_autopm_put_interface_async(struct usb_interface
- the usb_interface whose counter should be decremented
This routine does much the same thing as usb_autopm_put_interface: It decrements intf's usage counter and schedules a delayed autosuspend request if the counter is <= 0. The difference is that it does not perform any synchronization; callers should hold a private lock and handle all synchronization issues themselves.
Typically a driver would call this routine during an URB's completion handler, if no more URBs were pending.