linux-kernel - RE: Scatter-gather list constraints

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Message-ID: <Pine.LNX.4.44L0.0806251023100.2578-100000@iolanthe.rowland.org>
Date:	Wed, 25 Jun 2008 10:24:53 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Perez-Gonzalez, Inaky" <inaky.perez-gonzalez@...el.com>
cc:	David Vrabel <david.vrabel@....com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	AntonioLin <antonio.lin@...ormicro.com>,
	<linux-usb@...r.kernel.org>
Subject: RE: Scatter-gather list constraints

On Tue, 24 Jun 2008, Perez-Gonzalez, Inaky wrote:

> >From: David Vrabel [mailto:david.vrabel@....com]
> >
> >> That would be ideal.  However there is no way to pass an S-G list
> along
> >> with an URB; there's no field for it in the data structure.  And none
> >> of the existing host controller drivers support such a thing.
> >>
> >> I suppose we could add a field to struct urb and add a flag
> indicating
> >> whether the controller driver supports S-G lists.
> >
> >This is what I was thinking.
> 
> That would simplify a *LOT* of WUSB wire-adapter code which now is a
> horrible kludge.

In what way would it simplify the code?

Note that usbcore already contains a scatter-gather library.  
(Unfortunately the library is limited in usefulness because it needs to
run in process context.)

Alan Stern

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