linux-kernel - Re: atl1 64-bit => 32-bit DMA borkage (reproducible, bisected)

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Message-ID: <20080504211507.GC1040@martell.zuzino.mipt.ru>
Date:	Mon, 5 May 2008 01:15:07 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Jay Cliburn <jacliburn@...lsouth.net>
Cc:	Luca Tettamanti <kronos.it@...il.com>,
	Chris Snook <csnook@...hat.com>, Jeff Garzik <jeff@...zik.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Christoph Lameter <clameter@....com>, torvalds@...l.org
Subject: Re: atl1 64-bit => 32-bit DMA borkage (reproducible, bisected)

Looking at how other netdevice drivers:

8139too and others checks netif_running() in interrupt handler.

r8169 has scary "50k$" question comment re irqs disabled after
interacting with hardware.

But the r8169 case should be fixed by atlx_irq_disable()?

Writes to REG_IMR, REG_ISR are commented in atl1_reset_hw(), why?
(I'll test that soon)

Do we have a theory why changing from 64-bit DMA mask to 32-bit mask
resurrects the bug? NIC here never showed any sort of corruption
described in commit which banned 64-bit DMA.

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