linux-kernel - Re: [ 056/127] Bluetooth: Fix not removing power

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Message-ID: <20120928222640.GA2309@kroah.com>
Date:	Fri, 28 Sep 2012 15:26:40 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Gustavo Padovan <gustavo.padovan@...labora.co.uk>
Cc:	Ben Hutchings <ben@...adent.org.uk>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, alan@...rguk.ukuu.org.uk,
	Vinicius Costa Gomes <vinicius.gomes@...nbossa.org>
Subject: Re: [ 056/127] Bluetooth: Fix not removing power_off delayed work

On Fri, Sep 28, 2012 at 07:19:27PM -0300, Gustavo Padovan wrote:
> * Ben Hutchings <ben@...adent.org.uk> [2012-09-29 00:13:03 +0200]:
> 
> > On Fri, 2012-09-28 at 13:33 -0700, Greg Kroah-Hartman wrote:
> > > 3.0-stable review patch.  If anyone has any objections, please let me know.
> > > 
> > > ------------------
> > > 
> > > From: Vinicius Costa Gomes <vinicius.gomes@...nbossa.org>
> > > 
> > > commit 78c04c0bf52360dc2f7185e99c8e9aa05d73ae5a upstream.
> > > 
> > > For example, when a usb reset is received (I could reproduce it
> > > running something very similar to this[1] in a loop) it could be
> > > that the device is unregistered while the power_off delayed work
> > > is still scheduled to run.
> > [...]
> > > --- a/net/bluetooth/hci_core.c
> > > +++ b/net/bluetooth/hci_core.c
> > > @@ -588,6 +588,8 @@ static int hci_dev_do_close(struct hci_d
> > >  {
> > >  	BT_DBG("%s %p", hdev->name, hdev);
> > >  
> > > +	cancel_delayed_work(&hdev->power_off);
> > [...]
> > 
> > This is not right for 3.0 as the type of hdev->power_off is struct
> > work_struct, not struct delayed_work.
> > 
> > When I looked at this for 3.2 it appeared that this fix might not be
> > required at all.
> 
> Yes, at that time we had a timer to run the work, at some point we changed it
> with a delayed_work but I don't remember exactly which version was it, 3.3 I
> think.

Thanks for letting me know, I'll go delete this from the 3.0 queue.

greg k-h
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