USB_AUTOPM_GET_INTER(9)                   USB Core APIs                   USB_AUTOPM_GET_INTER(9)



NAME
       usb_autopm_get_interface - increment a USB interface's PM-usage counter

SYNOPSIS
       int usb_autopm_get_interface(struct usb_interface * intf);

ARGUMENTS
       intf
           the usb_interface whose counter should be incremented

DESCRIPTION
       This routine should be called by an interface driver when it wants to use intf and needs
       to guarantee that it is not suspended. In addition, the routine prevents intf from being
       autosuspended subsequently. (Note that this will not prevent suspend events originating in
       the PM core.) This prevention will persist until usb_autopm_put_interface is called or
       intf is unbound. A typical example would be a character-device driver when its device file
       is opened.

       intf's usage counter is incremented to prevent subsequent autosuspends. However if the
       autoresume fails then the counter is re-decremented.

       This routine can run only in process context.

RETURN
       0 on success.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                   USB_AUTOPM_GET_INTER(9)