linux-kernel - Re: [PATCH] Properly unregister reboot notifier in case of failure in ehci hcd

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Message-ID: <20060714164637.79842.qmail@web81212.mail.mud.yahoo.com>
Date:	Fri, 14 Jul 2006 09:46:36 -0700 (PDT)
From:	Aleksey Gorelov <dared1st@...oo.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	linux-usb-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, gregkh@...e.de, david-b@...bell.net,
	stern@...land.harvard.edu
Subject: Re: [PATCH] Properly unregister reboot notifier in case of failure in ehci hcd

--- Andrew Morton <akpm@...l.org> wrote:

> On Tue, 11 Jul 2006 23:38:41 -0700 (PDT)
> Aleksey Gorelov <dared1st@...oo.com> wrote:
> 
> >   If some problem occurs during ehci startup, for instance, request_irq fails, echi hcd driver
> > tries it best to cleanup, but fails to unregister reboot notifier, which in turn leads to
> crash on
> > reboot/poweroff. Below is the patch against current git to fix this.
> >   I did not check if the same problem existed for uhci/ohci host drivers.
> 
> This patch causes hangs at reboot/shutdown/suspend time.  See
> http://www.zip.com.au/~akpm/linux/patches/stuff/dsc03597.jpg
> 
Oops, I did not test it with suspend/resume stuff, sorry. The problem is that ehci_run is called
from resume without its counterpart ehci_stop in suspend, so notifier ends up registered twice.

David, Alan,

Do you think it is Ok to unregister reboot notifier in ehci_run before registering one to make
sure there is no 'double registering' of notifier, or is it better to move register/unregister
reboot notifier from ehci_run/ehci_stop completely to some other place ?

Aleks.

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