Using wpa_supplicant.conf with removable WiFi modules?

Peer, Ilan ilan.peer
Tue May 19 00:46:46 PDT 2015

> -----Original Message-----
> From: John Ernberg [mailto:john.ernberg at]
> Sent: Tuesday, May 19, 2015 09:46
> To: Peer, Ilan; hostap at
> Subject: Re: Using wpa_supplicant.conf with removable WiFi modules?
> On 2015-05-19 08:29, Peer, Ilan wrote:
> > Hi,
> >
> >> -----Original Message-----
> >> From: hostap-bounces at [mailto:hostap-
> >> bounces at] On Behalf Of John Ernberg
> >> Sent: Tuesday, May 19, 2015 09:10
> >> To: hostap at
> >> Subject: Using wpa_supplicant.conf with removable WiFi modules?
> >>
> >> Hi
> >>
> >> We're trying to use wpa_supplicant 2.4 with our removable WiFi module
> >> for P2P connections. It requires some device specific settings that
> >> we specified in the .conf file. The problem is that due to how
> >> configurations are assigned to
> > Can you clarify this statement? What's the problem in here?
> >
> >> interfaces, we have to restart wpa_supplicant every time we re-insert
> >> the module. This is not preferable to us.
> > Not sure that this is the case, but is it possible that when you are removing
> your module cfg80211.ko is unloaded? If this is the case, then you need to
> restart wpa_supplicant as the nl80211 sockets are closed when cfg80211.ko
> is unloaded.
> >
> > Regards,
> >
> > Ilan.
> Hi
> When we remove the WiFi module, the interfaces disappear, when we insert
> it again, the interfaces will appear again. wpa_supplicant will not apply the
> configuration again as it is only applied on the interfaces when
> wpa_supplicant starts. For our use-case it is not desirable to have to restart
> wpa_supplicant when the module is re-inserted so that the configuration file
> is applied on the interfaces provided by the WiFi module.
> For wpa_supplicant to be able to make a P2P connection using the module we
> have, we must configure the settings mentioned in the previous mail.
> I hope this was the clarification you were looking for, otherwise I'll try again.
> We have the cfg80211 driver as part of the kernel instead of a module, it is
> never removed.

Can you please share the wpa_supplicant log file?

BTW, what device are using? From what I see in the code, such flow would indeed not work for devices the support a dedicated P2P Device interface.



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