Hello, on my system with a custom kernel 4.13.0-rc1 and a BCM4360 (device ID
0x43a0), both this package and package broadcom-sta-source build a 'wl.o' that
fails in apparently the same way: a 'wlan0' device appears, but it is not
usable, and the kernel dmesg contains repeated error messages.

From my reading driver source, it looks like every device-private ioctl returns
the value -14. I've no idea what that means, but I found a macro
BCME_BUFTOOSHORT with

In the past, I had an earlier version of this driver (with hand-made patches to
compile against the newer kernel) working on this same laptop with this same
kernel. So I suppose the fact that it's not working now means that either
there's been a regression, or that some other change I've made has broken this
driver somehow.

As I continue to narrow down the problem, I'll add additional information to
this bug report.