Re: initial 11n support for iwn (n, not m)

[Stuart Henderson]

On 2015/12/17 19:43, Frank Groeneveld wrote:
> iwn0: fatal firmware error

So this firmware crash...

> firmware error log:
>   error type      = "UNKNOWN" (0x000014E2)
>   program counter = 0x00018100
>   source line     = 0x00000216
>   error data      = 0x0000000000000028
>   branch link     = 0x000180E2000180E2
>   interrupt link  = 0x0000DBEA00000000
>   time            = 3006541902

I'm seeing the same crash when I associate to a 2GHz channel where
the AP has set a flag in beacons to warn stations that there are
non-11n devices associated.

Around line 4900 in sys/dev/pci/if_iwn.c you have this:

                case IEEE80211_HTPROT_NONE:
                        break;
                case IEEE80211_HTPROT_NONMEMBER:
                case IEEE80211_HTPROT_NONHT_MIXED:
                        sc->rxon.flags |=
                            htole32(IWN_RXON_HT_RXON_HT_MODE_MIXED);
                        break;

Try this as I suspect it might fix your crash (unless Stefan
comes up with a better change to try first :)

                case IEEE80211_HTPROT_NONE:
                        break;
                case IEEE80211_HTPROT_NONMEMBER:
                case IEEE80211_HTPROT_NONHT_MIXED:
                        if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan))
                                sc->rxon.flags |=
                                    htole32(IWN_RXON_HT_RXON_HT_MODE_MIXED);
                        break;