USB: serial: full autosuspend support for the option driver
this adds autosupport usable even in an always online mode. - enables remote wakeup on open - autoresume for sending - timeout based autosuspend if nothing is sent or recieved - autosuspend without remote wakeup support on open/close Signed-off-by: Oliver Neukum <oliver@neukum.org> Tested-off-by: Zhao Ming <zhao.ming9@zte.com.cn> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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