netdev - Re: [PATCH] net/wireless: CFG80211_WEXT_EXPORT requires wireless extensions

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Date:	Sat, 11 Apr 2015 22:41:37 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	"David S. Miller" <davem@...emloft.net>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net/wireless: CFG80211_WEXT_EXPORT requires wireless extensions

On Saturday 11 April 2015 08:16:51 Johannes Berg wrote:
> On Sat, 2015-04-11 at 00:29 +0200, Arnd Bergmann wrote:
> > The CFG80211_WEXT_EXPORT symbol is selected by two drivers that
> > make direct use of compat handlers for the wireless ioctls.
> > However, this has no effect when the wireless extensions themselves
> > are disabled, and results in a link error:
> > 
> > ERROR: "cfg80211_wext_giwrts" [drivers/net/wireless/orinoco/orinoco.ko] undefined!
> > ERROR: "cfg80211_wext_siwfrag" [drivers/net/wireless/orinoco/orinoco.ko] undefined!
> > ERROR: "cfg80211_wext_giwname" [drivers/net/wireless/ipw2x00/ipw2200.ko] undefined!
> > 
> > This changes the Kconfig logic so that CFG80211_WEXT can not
> > be disabled when CFG80211_WEXT_EXPORT is set.
> 
> > +++ b/net/wireless/Kconfig
> > @@ -178,7 +178,6 @@ config CFG80211_WEXT
> >       bool "cfg80211 wireless extensions compatibility"
> 
> (I added "if !CFG80211_WEXT_EXPORT" to this line)

Right, that works just as well, thanks!

> >       depends on CFG80211
> >       select WEXT_CORE
> > -     default y if CFG80211_WEXT_EXPORT
> >       help
> >         Enable this option if you need old userspace for wireless
> >         extensions with cfg80211-based drivers.
> > @@ -186,6 +185,7 @@ config CFG80211_WEXT
> >  config CFG80211_WEXT_EXPORT
> >       bool
> >       depends on CFG80211
> > +     select CFG80211_WEXT
> 
> This doesn't work afaict because select won't go through if this is
> selected. I've already sent a fix for this in my latest pull request
> that has the above.

As Paul commented, it does work, and I have of course checked that my
patch fixes the problem without introducing other build failures.

	Arnd
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