linux-kernel - Re: [PATCH 1/1] UBUNTU: SAUCE: khubd -- switch USB product/manufacturer/serial handling to RCU

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Message-ID: <20100614111734.GT12061@shadowen.org>
Date:	Mon, 14 Jun 2010 12:17:34 +0100
From:	Andy Whitcroft <apw@...onical.com>
To:	Greg Kroah-Hartman <gregkh@...e.de>, linux-usb@...r.kernel.org
Cc:	Inaky Perez-Gonzalez <inaky.perez-gonzalez@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] UBUNTU: SAUCE: khubd -- switch USB
 product/manufacturer/serial handling to RCU

On Mon, Jun 14, 2010 at 12:14:28PM +0100, Andy Whitcroft wrote:
> With the introduction of wireless USB hubs the product, manufacturer,
> and serial number are now mutable.  This necessitates new locking in the
> consumers of these values including the sysfs read routines in order to
> prevent use-after-free acces to these values.  These extra locks create
> significant lock contention leading to increased boot times (0.3s for an
> example Atom based system).  Move update of these values to RCU based
> locking.

Bah, some Ubuntu-ism leaked out in the summary test, I've resent it with
those removed.

-apw
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