I've discovered the kernel 3.9 drivers will compile and work in kernel 3.11 if the following line in sierra.c
ifnum = port->number - serial->minor;
is replaced with:
ifnum = port->port_number;
I've discovered the kernel 3.9 drivers will compile and work in kernel 3.11 if the following line in sierra.c
ifnum = port->number - serial->minor;
is replaced with:
ifnum = port->port_number;