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USB: serial: enable async suspend for usb serial port device
Usb serial port device is child of its usb interface device, so we can enable async suspend of usb serial port device to speedup system suspend. Signed-off-by: Ming Lei <tom.leiming@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -1071,6 +1071,8 @@ int usb_serial_probe(struct usb_interface *interface,
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dev_set_name(&port->dev, "ttyUSB%d", port->number);
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dbg ("%s - registering %s", __func__, dev_name(&port->dev));
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port->dev_state = PORT_REGISTERING;
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device_enable_async_suspend(&port->dev);
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retval = device_add(&port->dev);
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if (retval) {
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dev_err(&port->dev, "Error registering port device, "
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