Unable to build module

Ubuntu-12.04.1 linux-3.2.0-29-generic-pae i686-SMP
Modem: 00:03.0 Communication controller: Conexant Systems, Inc. HSF 56k
HSFi Modem (rev 01)

Building modules for kernel 3.2.0-29-generic-pae, using source directory
/lib/modules/3.2.0-29-generic-pae/build. Please wait...
ERROR: Module build failed!

In the logs:

[...]
In file included from /usr/lib/hsfmodem/modules/osservices.c:20:0:
/usr/lib/hsfmodem/modules/GPL/oscompat.h:201:57: error:
'SPIN_LOCK_UNLOCKED' undeclared here (not in a function)
/usr/lib/hsfmodem/modules/osservices.c:51:28: fatal error:
linux/smp_lock.h: No such file or directory
compilation terminated.
[...]

What do I do?

Thanks!