Re: [linux-usb-devel] Re: Unaligned scatter-gather buffers and usb-storage

From: Jens Axboe <axboe@suse.de>
To: James Bottomley <James.Bottomley@steeleye.com>
Cc: Oliver Neukum <oliver@neukum.org>,
	Patrick Mansfield <patmans@us.ibm.com>,
	Alan Stern <stern@rowland.harvard.edu>,
	Douglas Gilbert <dougg@torque.net>,
	SCSI development list <linux-scsi@vger.kernel.org>,
	USB development list <linux-usb-devel@lists.sourceforge.net>
Subject: Re: [linux-usb-devel] Re: Unaligned scatter-gather buffers and usb-storage
Date: Wed, 19 Nov 2003 16:00:11 +0100	[thread overview]
Message-ID: <20031119150011.GJ1106@suse.de> (raw)
In-Reply-To: <1069253904.10768.13.camel@mulgrave>

On Wed, Nov 19 2003, James Bottomley wrote:
> > > Alternatively, we could add this as yet another parameter to the host
> > > and template structures.  Any preferences?
> > 
> > I suppose you have to, if you want LLD to be able to pass it down.
> 
> Well, what I was fishing for: Is this property useful enough to want
> every device driver writer to think about it (i.e. document and place in
> the template),  or is it rare enough that it should only be accessible
> to those who know what they're doing (via the direct block queue
> interfaces in slave_alloc/configure)?

As far as I'm concerned, requiring 512-byte alignment is 'just
easier'... Only a select few host adapters will set it differently
anyways, so you gain basically nothing.

-- 
Jens Axboe