netdev - Re: 2.6.20->2.6.21 - networking dies after random time

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Message-Id: <1185437431.3227.21.camel@chaos>
Date:	Thu, 26 Jul 2007 10:10:31 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jarek Poplawski <jarkao2@...pl>
Cc:	Marcin Ślusarz <marcin.slusarz@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jean-Baptiste Vignaud <vignaud@...dmail.fr>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	shemminger <shemminger@...ux-foundation.org>,
	linux-net <linux-net@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: 2.6.20->2.6.21 - networking dies after random time

On Thu, 2007-07-26 at 10:13 +0200, Jarek Poplawski wrote:
> > I wanted to test them all on 2.6.22.1, but I didn't have enough time.
> > I've verified only that 2.6.22.1 has the same problem. I can test it
> > later, but I can report results back at beginning of next week.
> 
> 
> So, everything is clear - any changes are good!
> Except the signed-off ones... 
> 
> Thanks Marcin,
> Jarek P.
> 
> PS: Now, it seems to me Thomas could be the nearest. BTW, could somebody
> give me some tip, how these re-triggered interrupts are skipped on dev's
> reset before enable_irq?

I think the correct solution is really not to resend level type
interrupts. If the interrupt line is still active, then the interrupt
comes up by itself. I'm cooking a patch for that.

The other question is: 

Is the driver confused by the resent irq or is the chip-set unhappy
about the resend ?

We could figure the latter out by activating the software based resend
method.

	tglx


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