linux-kernel - Re: [PATCH] usb: at91_udc: correct hanging while disconnecting usb cable

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Date:	Thu, 6 Dec 2007 08:02:52 -0800
From:	David Brownell <david-b@...bell.net>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
Cc:	Andrew Victor <linux@...im.org.za>,
	Patrice VILCHEZ <patrice.vilchez@...el.com>,
	ARM Linux Mailing List 
	<linux-arm-kernel@...ts.arm.linux.org.uk>,
	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: at91_udc: correct hanging while disconnecting usb cable

On Thursday 06 December 2007, Nicolas Ferre wrote:
> Correct hanging while disconnecting the USB device 
> cable. Prevent a race between vbus and UDP interrupts.
> This bug was tracked on at91sam9260ek boards.
> 
> Signed-off-by: Nicolas Ferre <nicolas.ferre@....atmel.com> 
> ---
> 
> A usb resume interrupt was firing after the vbus 
> interrupt : the IP was then already stoped and not able 
> to deal with it (no more clock). A simple interrupt disabling 
> is ok as the "end of bus reset" irq is non maskable and ok 
> to resume the USB device IP.

Good, thanks for finding this.  The bug was reported
recently, and obviously can't be reproduced except on
boards which *have* a VBUS interrupt!

I've signed off on this and suggested Greg merge it
before the 2.6.24-final freeze.

- Dave
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