linux-kernel - Re: [PATCH wireless-2.6 or stable] iwlwifi: return error when fail to start scanning

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Date:	Wed, 06 Oct 2010 10:48:49 -0700
From:	"Guy, Wey-Yi" <wey-yi.w.guy@...el.com>
To:	Florian Mickler <florian@...kler.org>,
	Stanislaw Gruszka <sgruszka@...hat.com>
Cc:	"linville@...driver.com" <linville@...driver.com>,
	"stable@...nel.org" <stable@...nel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"Chatre, Reinette" <reinette.chatre@...el.com>,
	"ilw@...ux.intel.com" <ilw@...ux.intel.com>,
	"Berg, Johannes" <johannes.berg@...el.com>,
	"Cahill, Ben M" <ben.m.cahill@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH wireless-2.6 or stable] iwlwifi: return error when fail
 to start scanning

On Wed, 2010-10-06 at 10:45 -0700, Florian Mickler wrote:
> Hi Stanislaw!
> 
> On Wed, 6 Oct 2010 18:04:35 +0200
> Stanislaw Gruszka <sgruszka@...hat.com> wrote:
> 
> > This is stable friendly backport of wireless-testing commit
> > 3eecce527c7434dfd16517ce08b49632c8a26717 "iwlwifi: unify scan start
> > checks". Wireless-testing version include also a lot of cleanups.
> > 
> > On error case in {iwl3945,iwlagn}_request_scan we queue abort_scan work,
> > which in a fact do nothing, so we never complete the scan. Thats gives
> > "WARNING: at net/wireless/core.c:614 wdev_cleanup_work" and stopped
> > network connection until reload iwlwifi modules. Return of -EIO and
> > stopping queuing any work is a fix.
> > 
> > Note there are still many cases when we can get: 
> > 
> > WARNING: at net/wireless/core.c:614 wdev_cleanup_work  
> > WARNING: at net/mac80211/scan.c:266 ieee80211_scan_completed
> > WARNING: at net/mac80211/scan.c:269 ieee80211_scan_complete
> > 
> > which are not fixed. Unfortunately does not exist single, small fix
> > for that problems, and we probably will see some more bug reports
> > with scan warnings. As solution we rewrite iwl-scan.c code to avoid
> > all possible race conditions. That quite big patch set is queued
> > for 2.6.37 .
> > 
> > Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@...el.com>

looks good to me

Thanks
Wey


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