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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>
This commit is contained in:
Ming Lei 2010-07-13 23:56:24 +08:00 committed by Greg Kroah-Hartman
parent d0390d92bf
commit a7a6b79bc5
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/serial/usb-serial.c
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@ -1071,6 +1071,8 @@ int usb_serial_probe(struct usb_interface *interface,
dev_set_name(&port->dev, "ttyUSB%d", port->number);
dbg ("%s - registering %s", __func__, dev_name(&port->dev));
port->dev_state = PORT_REGISTERING;
device_enable_async_suspend(&port->dev);
retval = device_add(&port->dev);
if (retval) {
dev_err(&port->dev, "Error registering port device, "