usb_autopm_put_interface_async — decrement a USB interface's PM-usage counter
|struct usb_interface * intf|
This routine does much the same thing as
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.
This routine can run in atomic context.