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Message-Id: <200803041251.06725.david-b@pacbell.net>
Date: Tue, 4 Mar 2008 12:51:06 -0800
From: David Brownell <david-b@...bell.net>
To: Alan Stern <stern@...land.harvard.edu>
Cc: Christian Kujau <lists@...dbynature.de>,
LKML <linux-kernel@...r.kernel.org>, 0x0007@...il.com,
USB list <linux-usb@...r.kernel.org>
Subject: Re: WARNING: at drivers/usb/host/ehci-hcd.c:287
On Tuesday 04 March 2008, Alan Stern wrote:
> Dave, it seems to me that this must be an example of a race between the
> iaa watchdog timer expiring and end_unlink_async() running. It's not
> good enough for end_unlink_async() to call iaa_watchdog_done(), because
> on an SMP system the timer may already have fired and the watchdog
> routine may be spinning on ehci->lock.
Right.
> How about replacing the
>
> WARN_ON(!ehci->reclaim);
Or bettter yet, just removing it entirely. ISTR doing that in some
patches I've not yet sent for merging, and expect that's what my
preferred fix will be ...
- Dave
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