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

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Date:	Fri, 28 Sep 2012 19:19:27 -0300
From:	Gustavo Padovan <gustavo.padovan@...labora.co.uk>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	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

* 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.

	Gustavo
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