Re: [PATCH] cfg80211: Fix race in bss timeout

[Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>]

On Wed, Dec 07, 2011 at 04:37:28PM +0100, Johannes Berg wrote:
> > 
> > These warnings are added in cfg80211_roamed().
> 
> But this can be called directly by the driver with a NULL BSS.
> 
> Ohh. I see what you did, you didn't allow drivers calling this now. I
> think you should export this function still since otherwise the race
> windows might get tiny, but isn't actually completely closed (the first
> get_bss() might find it, the next a millisecond later not)

I can understand the millisecond delay between cfg80211_get_bss() in driver and
__cfg80211_roamed() as there can be delay in event_work getting
scheduled. I don't understand the delay between driver and
cfg80211_roamed() as the later one is direct call. Or this can be
done later if experienced the delay?.

Vasanth