Re: Oops involving RFCOMM and sysfs

On Jan 17, 2008 7:06 AM, Gabor Gombas <[email protected]> wrote:
> 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 <[email protected]>
>
> 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.

Weird, I guess "device_move(dev, NULL) two times" cause the problem.

Anyway, device_move should check the old_parent and new_parent , if
they equal to each other then just return.

Am I right?

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

-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/