linux-kernel - Re: [bug] ata subsystem related crash with latest -git

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Message-ID: <4716B37B.3050102@pobox.com>
Date:	Wed, 17 Oct 2007 21:14:35 -0400
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	jens.axboe@...cle.com
CC:	mingo@...e.hu, linux-kernel@...r.kernel.org,
	alan@...rguk.ukuu.org.uk, tomof@....org
Subject: Re: [bug] ata subsystem related crash with latest -git

On a related hardware note:

FWIW, most ATA controllers have scatter/gather tables that terminate 
themselves by a bit in the final s/g entry.  The 90% case needs to know 
the last scatterlist entry, at the end of the s/g walk.

So however this all gets worked out, please make sure not to unduly 
punish libata controllers with an expensive sg_last() inside a loop, or 
something like that.  :)

	Jeff

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