linux-kernel - Re: Scatter-gather list constraints

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Message-ID: <Pine.LNX.4.44L0.0806261016590.2811-100000@iolanthe.rowland.org>
Date:	Thu, 26 Jun 2008 10:18:30 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Jens Axboe <jens.axboe@...cle.com>
cc:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	<andi@...stfloor.org>, <linux-kernel@...r.kernel.org>,
	<antonio.lin@...ormicro.com>, <david.vrabel@....com>
Subject: Re: Scatter-gather list constraints

On Thu, 26 Jun 2008, Jens Axboe wrote:

> I don't think adding anything in the general IO path makes a lot of
> sense, this is a really screwy case. I don't mind adding work-arounds to
> the block layer to cater for hardware weirdness, but this is getting a
> little silly. We could provide a helper function for 'bouncing' this
> request and thus reuse the block bounce buffer for this, but I'm not
> even sure how to simply express this generically. As it is likely of no
> use outside of this specific case, putting it in the driver (or usb
> layer, if you expect more of these similar cases) is the best option.

That sounds great.  If any of you could provide the bounce-buffer 
helper functions, I will be pleased to write the USB-specific code to 
call them.

Alan Stern

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