linux-kernel - Re: [linux-usb-devel] [PATCH] bug removing ehci-hcd

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Date:	Thu, 7 Jun 2007 11:22:25 +0530
From:	"Satyam Sharma" <satyam.sharma@...il.com>
To:	"Greg KH" <greg@...ah.com>
Cc:	Stuart_Hayes@...l.com, akpm@...ux-foundation.org,
	malattia@...ux.it, gregkh@...e.de, linux-kernel@...r.kernel.org,
	dbrownell@...rs.sourceforge.net,
	linux-usb-devel@...ts.sourceforge.net
Subject: Re: [linux-usb-devel] [PATCH] bug removing ehci-hcd

Hi,

I remember this one ...

On 6/7/07, Greg KH <greg@...ah.com> wrote:
> On Thu, May 31, 2007 at 10:26:10AM -0500, Stuart_Hayes@...l.com wrote:
> >
> > I wasn't actually able to reproduce the bug myself, but I guess it is
> > pretty obvious that I shouldn't have called cpufreq_unregister_notifier
> > with a spinlock held.  I haven't been doing this long enough to know
> > exactly which kernel this patch should be against, so let me know if
> > this ins't good.  Thanks!
> >
> >
> > This patch (for the 2.6.21.3 kernel plus previously sent cpufreq
> > notifier patch) fixes a bug caused by calling
> > cpufreq_unregister_notifier (which can sleep) while holding a spinlock.
> >
> > Signed-off-by: Stuart Hayes <stuart_hayes@...l.com>
>
> Hm, this doesn't apply to the 2.6.21.3 kernel.

The cpufreq patches only live in -mm as of now ...

> Can you send both patches merged together?
>
> And is the fix already in Linus's tree?

Andrew seems to have already fixed this in the latest -mm
(in this very thread, funnily enough, looks like you missed it
as the subject change broke the threading :-)

[ There is a subtle difference, however, in that Andrew's
fix pushes the notifier unregistration /after/ the
spin_unlock_irq(&ehci->lock) critical section whereas Stuart
seems to be prefer doing it /before/ the corresponding
spin_lock_irq() ... ]

Satyam
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