brcm80211: brcmsmac not working on channel 13

Hi,

using my MacMini 4,1 integrated wireless adapter on kernel 3.2 and 
brcmsmac I cannot connect to AP on channel 13, other 2.4 GHz channels 
work fine.
When booting MacOsX with the same AP on channel 13 it works.

My distro is Debian and I tried to set country code via:
- iw reg set
- crda
- setting the AP to broadcast country code
but made no difference.

The very same issue with detailed symptoms is described here:

http://133nux.blogspot.com/2011/12/missing-channel-13-this-time-broadcom.html

I tried the fix proposed in the above page, basically in 
brcmsmac/channel.c struct locale_info change from 
LOCALE_RESTRICTED_SET_2G_SHORT to LOCALE_RESTRICTED_NONE.
To me this seems like a hack, but works. Can you please comment?

Is this a bug or the code was intented that way?
if the latter how am I supposed to use channel 13?

uname and lspci output follows:

frankio@debmini:~$ uname -a
Linux debmini 3.2.0-1-686-pae #1 SMP Fri Feb 17 06:27:21 UTC 2012 i686 GNU/Linux

frankio@debmini:~$ lspci -v -d 14e4:4353
03:00.0 Network controller: Broadcom Corporation BCM43224 802.11a/b/g/n (rev 01)
	Subsystem: Apple Computer Inc. Device 0093
	Flags: bus master, fast devsel, latency 0, IRQ 21
	Memory at d3300000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: <access denied>
	Kernel driver in use: brcmsmac

thank you
Francesco