netdev - Re: [Bug 11442] btusb suspend/resume bug...

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Date:	Wed, 01 Oct 2008 00:03:49 +0200
From:	Marcel Holtmann <marcel@...tmann.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	David Miller <davem@...emloft.net>,
	linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
	bugme-daemon@...zilla.kernel.org
Subject: Re: [Bug 11442] btusb suspend/resume bug...

Hi Rafael,

> > > > >> Rafael, can you pull from my tree and test the changes:
> > > > >>
> > > > >> git://git.kernel.org/pub/scm/linux/kernel/git/holtmann/ 
> > > > >> bluetooth-2.6.git
> > > > >>
> > > > >> It would be interesting if these fixes are enough.
> > > > >
> > > > > They appear to be enough.  I haven't had any suspend/resume failures  
> > > > > with them
> > > > > applied.
> > > > 
> > > > so it works _without_ applying patch-btusb-suspend.
> > > 
> > > Well, unfortunately I spoke too soon.
> > > 
> > > I'm still seeing post-hibernation crashes triggered by the bluetooth user land
> > > trying to use the device handled by btusb.  They happen every second
> > > hibernation, more or less, and apparently they are oopses in various code
> > > paths not directly related to bluetooth, like ext3 (memory corruption or
> > > what?).
> > 
> > I pushed two extra patches to my bluetooth-2.6 repository:
> > 
> > git://git.kernel.org/pub/scm/linux/kernel/git/holtmann/bluetooth-2.6.git
> > 
> > One is fixing a double-free in the error path. This error path can be
> > triggered during suspend/resume if the USB core just disconnects the
> > device. Please check if that fixes it for you.
> > 
> > > With patch-btusb-suspend applied I don't see them (actually I have to use
> > > a slightly modified version of the patch which is appended).
> > > 
> > > Interestingly enough, suspend to RAM works without any visible problems.
> > 
> > As Oliver said, the USB core should do the right thing when no suspend
> > and resume callbacks are provided. I looked through the code so many
> > times now and I am running out of ideas what can happen.
> > 
> > Lets try it one last time without the suspend patch, but the double free
> > fix and see if that works. Otherwise I really give up.
> 
> This time I cannot reproduce the hibernation issue without the suspend patch,
> so it appears that your double-free fix works for me.

great. So I push these for 2.6.27 and then for 2.6.28, we can add full
suspend and auto-suspend and remote-wakeup support. Thanks for testing.

Regards

Marcel


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