netdev - Re: 3.3.0-rc5: OOps in dql_completed (Broadcom tg3 driver)

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Date:	Fri, 02 Mar 2012 06:30:46 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Christoph Lameter <cl@...two.org>
Cc:	mcarlson@...adcom.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Tom Herbert <therbert@...gle.com>
Subject: Re: 3.3.0-rc5: OOps in dql_completed (Broadcom tg3 driver)

Le jeudi 01 mars 2012 à 15:13 -0600, Christoph Lameter a écrit :
> Dell R620. 2x 2.9Ghz Sandybridge
> 
> Sadly I could only get a screenshot and the top of the dump has scrolled
> off the system.
> 

Thanks Christoph for this report.

Tom, dql_queued() assumes caller checked availability in the queue with
dql_avail(), but its not the case if tg3_tso_bug() is called.

        do {
                nskb = segs;
                segs = segs->next;
                nskb->next = NULL;
                tg3_start_xmit(nskb, tp->dev);
        } while (segs);

In case we hit BQL limit in one of the tg3_start_xmit() calls, we should
'abort' the following ones, dont you think ?

Or maybe thats irrelevant, and only dql_queued() comment is wrong.

Thanks


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