Date: Tue, 27 Sep 2005 08:27:41 -0700
From: David Brownell <david-b@pacbell.net>
To: vendor-sec@lst.de, security@linux.kernel.org,
       linux-usb-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org,
       laforge@gnumonks.org, hch@infradead.org, greg@kroah.com
Subject: Re: [vendor-sec] [BUG/PATCH/RFC] Oops while completing async USB via 
 usbdevio
References: <20050925151330.GL731@sunbeam.de.gnumonks.org>
 <20050927080413.GA13149@kroah.com>
 <20050927124846.GA29649@infradead.org>
 <20050927125755.GA10738@kroah.com>
 <20050927125956.GA29861@infradead.org>
 <20050927130937.GA11060@kroah.com>
In-Reply-To: <20050927130937.GA11060@kroah.com>
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On Tue, 27 Sep 2005 at 06:09:38 Greg KH wrote:
> On Tue, Sep 27, 2005 at 01:59:56PM +0100, Christoph Hellwig wrote:
> > 
> > This is more than messy.  usbfs is the only user of SI_ASYNCIO, and the
> > way it uses it is more than messy.  Why can't USB simply use the proper
> > AIO infrastructure?
>
> No one has taken the time and effort to do this.  No other reason that I
> know of.  David?  I know you have looked into this a bit in the past.

Time and effort are the main issues I know of.  First we'd need some
kind of FD-per-endpoint infrastructure, then it should be easy to
implement the AIO file ops, one kiocb per URB ... much like "gadgetfs"
does for USB peripherals, one kiocb per usb_request.

- Dave

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