[RFC] nl80211: allow Android P2P functionality

[Johannes Berg]

Hi,

> Seems device is created success

> p2p0     DOWN                                   0.0.0.0/0   0x00001002
> 00:0a:62:27:26:4d

> wlan0    DOWN                                   0.0.0.0/0   0x00001002
> 00:0a:62:27:26:4c

Looks like.

> D/wpa_supplicant( 2431): nl80211: RFKILL status not available
> D/wpa_supplicant( 2431): nl80211: Set mode ifindex 23 iftype 2 (STATION)
> D/wpa_supplicant( 2431): nl80211: Failed to set interface 23 to mode
> 2: -22 (Invalid argument)

That seems like you didn't patch the supplicant with this patch? With
this patch it won't try to set to mode 2 (station). Or is 23 the 'wlan0'
interface? I doubt it though, it's in station mode and should be ok.

> And the reason the the wpa_supplicant get the "failed to set
> interface" is because the code run into  nl80211.c
> 
> #ifdef CPTCFG_CFG80211_ANDROID_P2P_HACK
>         if (otype == NL80211_IFTYPE_P2P_DEVICE) {
>                 if (ntype == NL80211_IFTYPE_P2P_DEVICE)
>                         return 0;
>                 return -EINVAL;
>         }
> #endif

Yes it's not supposed to change the iftype here.

> BTW the wlan0 will always keep in DOWN status after the p2p0 device
> UP, and it will show
> root at android:/data/misc/wifi # netcfg wlan0 up
> netcfg wlan0 up
> action 'up' failed (Device or resource busy)
> 
> Seems the p2p0 and wlan0 can not be UP at the same time?  I though
> there are both virtual interface and can work in different mode at the
> same time. anything I miss?

That depends on your driver.

johannes