linux-kernel - Re: [ANNOUNCE] 2.6.33-rc8-rt1

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Message-ID: <520f0cf11002220423u64daf89dxa6a4249522adabee@mail.gmail.com>
Date:	Mon, 22 Feb 2010 13:23:33 +0100
From:	John Kacur <jkacur@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	rt-users <linux-rt-users@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Carsten Emde <ce@...g.ch>,
	Clark Williams <williams@...hat.com>,
	Frank Rowand <frank.rowand@...sony.com>,
	Robin Gareus <robin@...eus.org>,
	Gregory Haskins <ghaskins@...ell.com>,
	Philippe Reynes <philippe.reynes@...smpp.fr>,
	Fernando Lopez-Lezcano <nando@...ma.stanford.edu>,
	Will Schmidt <will_schmidt@...t.ibm.com>,
	Darren Hart <dvhltc@...ibm.com>, Jan Blunck <jblunck@...e.de>,
	Sven-Thorsten Dietrich <sdietrich@...ell.com>,
	Jon Masters <jcm@...hat.com>,
	Mark Knecht <markknecht@...il.com>,
	Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: [ANNOUNCE] 2.6.33-rc8-rt1

On Mon, Feb 22, 2010 at 12:28 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Mon, 22 Feb 2010, John Kacur wrote:
>> On Mon, Feb 22, 2010 at 12:24 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
>> > We are zooming in, but there is still a way to go!
>> >
>>
>> Woohoo! More -rt fun.
>>
>> Unfortunately, I can't log in on my T500 with this kernel though.
>> The following shows-up on my serial console.
>> ------------[ cut here ]------------
>> WARNING: at /home/jkacur/rt.linux.git/net/mac80211/rx.c:2467 ieee80211_rx+0x4c/0
>> x721 [mac80211]()
>
> Fix below. Thanks,
>
>    tglx
> ----
> diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
> index 82a30c1..e735c17 100644
> --- a/net/mac80211/rx.c
> +++ b/net/mac80211/rx.c
> @@ -2464,7 +2464,7 @@ void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
>        struct ieee80211_supported_band *sband;
>        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
>
> -       WARN_ON_ONCE(softirq_count() == 0);
> +       WARN_ON_ONCE_NONRT(softirq_count() == 0);
>
>        if (WARN_ON(status->band < 0 ||
>                    status->band >= IEEE80211_NUM_BANDS))
> --

Thanks Thomas

That patch fixes the symptom I reported, but unfortunately, I still
can't log-in to my laptop without the machine freezing.
Not sure why, investigating.

John
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