Man page 9 : usb_autopm_get_interface_async

usb_autopm_get_interface_async - increment a USB interfaceAqs PM-usage counter

int usb_autopm_get_interface_async(struct usb_interface *  intf );

intf
    the usb_interface whose counter should be incremented

This routine does much the same thing as usb_autopm_get_interface: It increments intfAqs usage counter and queues an autoresume request if the device is suspended. The differences are that it does not perform any synchronization (callers should hold a private lock and handle all synchronization issues themselves), and it does not autoresume the device directly (it only queues a request). After a successful call, the device may not yet be resumed.

This routine can run in atomic context.