linux-kernel - Re: [PATCH rc8-mm1] hotfix libata-scsi corruption

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Message-ID: <20080122221214.1c825949@lxorguk.ukuu.org.uk>
Date:	Tue, 22 Jan 2008 22:12:14 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Hugh Dickins <hugh@...itas.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jeff Garzik <jeff@...zik.org>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH rc8-mm1] hotfix libata-scsi corruption

> However, I'd like to see if we can track the problem through the SG_IO
> direct path ... how many adjacent page bytes are corrupt?  Just a few or
> a large number (I'm wondering if it's an off by one or off by alignment
> type bug)?

Which ATA controller is involved - in theory ATA DMA is byte aligned safe
(or dword anyway) in practice I don't know if we've ever tested the non
512 byte aligned case historically for ATA just ATAPI ?

Alan
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