linux-kernel - Re: [Bluez-devel] Oops involving RFCOMM and sysfs

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Date:	Thu, 17 Jan 2008 00:06:46 +0100
From:	Gabor Gombas <gombasg@...aki.hu>
To:	Dave Young <hidave.darkstar@...il.com>
Cc:	Cornelia Huck <cornelia.huck@...ibm.com>,
	Tejun Heo <htejun@...il.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	linux-kernel@...r.kernel.org, bluez-devel@...ts.sf.net,
	kay.sievers@...y.org, Greg KH <greg@...ah.com>,
	Marcel Holtmann <marcel@...tmann.org>, davem@...emloft.net
Subject: Re: [Bluez-devel] Oops involving RFCOMM and sysfs

Hi,

On Wed, Jan 16, 2008 at 09:02:05AM +0800, Dave Young wrote:

> The rfcomm tty device will possibly retain even when conn is down,
> and sysfs doesn't support zombie device moving, so this patch
> move the tty device before conn device is destroyed.
> 
> Signed-off-by: Dave Young <hidave.darkstar@...il.com> 

This seems to work, both the oops and the hang are gone. I get these
messages in syslog when the Bluetooth link hangs and I want to kill pppd
with "poff":

Jan 16 23:55:59 twister kernel: unregister_netdevice: waiting for ppp0 to become free. Usage count = 1
Jan 16 23:56:09 twister kernel: unregister_netdevice: waiting for ppp0 to become free. Usage count = 1

But a "killall -9 pppd" seems to help and then the re-connect (after the
phone got power-cycled) works.

Gabor

-- 
     ---------------------------------------------------------
     MTA SZTAKI Computer and Automation Research Institute
                Hungarian Academy of Sciences
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