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

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Message-ID: <Pine.LNX.4.44L0.0607141430040.7820-100000@iolanthe.rowland.org>
Date:	Fri, 14 Jul 2006 14:37:41 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Aleksey Gorelov <dared1st@...oo.com>
cc:	Andrew Morton <akpm@...l.org>, <david-b@...bell.net>,
	<gregkh@...e.de>, <linux-usb-devel@...ts.sourceforge.net>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [linux-usb-devel] [PATCH] Properly unregister reboot notifier
 in case of failure in ehci hcd

On Fri, 14 Jul 2006, Aleksey Gorelov wrote:

> > 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 ?

Dave has a better idea than I do about where a good spot might be for 
registering the notifier.

However, it is always possible to avoid "double registering" by keeping a
private flag that you set when the notifier is registered.  Then you can
simply skip registering if the flag is already set.

Alan Stern

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