linux-kernel - RE: Scatter-gather list constraints

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Message-ID: <C72DEB015BA7724783363DE1AF6B0F980510BAC2@orsmsx417.amr.corp.intel.com>
Date:	Tue, 24 Jun 2008 21:02:58 -0700
From:	"Perez-Gonzalez, Inaky" <inaky.perez-gonzalez@...el.com>
To:	"David Vrabel" <david.vrabel@....com>,
	"Alan Stern" <stern@...land.harvard.edu>
Cc:	"Kernel development list" <linux-kernel@...r.kernel.org>,
	"AntonioLin" <antonio.lin@...ormicro.com>,
	<linux-usb@...r.kernel.org>
Subject: RE: Scatter-gather list constraints

>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.

-- Inaky

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