linux-kernel - RE: Scatter-gather list constraints

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/