ar9170 compat-wireless build failure

While trying to build the compat-wireless drivers on a Fedora 11 system with a 2.6.30.10 kernel, I get the following error message during compile:

/home/gus/src/compat-wireless/compat-wireless-2010-03-05/drivers/net/wireless/ath/ar9170/usb.c:
In function ‘ar9170_usb_firmware_failed’:
/home/gus/src/compat-wireless/compat-wireless-2010-03-05/drivers/net/wireless/ath/ar9170/usb.c:730:
error: implicit declaration of function ‘device_lock’ /home/gus/src/compat-wireless/compat-wireless-2010-03-05/drivers/net/wireless/ath/ar9170/usb.c:733:
error: implicit declaration of function ‘device_unlock’

I've grep'd through the sources and can't find any device_lock function, so this appears to be missing from either compat-wireless or my kernel.

Gus