[Bluez-users] Re: bnep module use count ...

[Marcel Holtmann <marcel@holtmann.org>]

Hi Wim,

> I have a theory about this module use count.
> 
> What is my setup.
> 
> When I insert the usb dongle, hci/sdp and pand --listen is started wating for 
> a connection.
> 
> Then I activate the connection on my Ipaq and notice in syslog that the 
> connection is request.
> 
> Pand will then create a bnep module in the kernel.  This will trigger a 
> hotplug event causing ifup to be executed on bnep0.
> 
> So far so good.
> 
> Now I disconnect my Ipaq. (either by pand -k and kill or whatever).  
> This event does not get detected by anybody.
> 
> The Ipaq when it comes back will request a new session and a new handle to 
> bnep0 is created in the kernel (causing refcount to increase beyond the real 
> use count).
> 
> Once this occurs the module is no longer unloadable and actually causes the 
> system to hang when the usb dongle is removed !!!! A reboot is then 
> needed ;-((((((
> 
> WHat you think of this scenario ?

this can be possible, but I can't tell you anything without more
information. Last time I check the reference counting it was working
perfect for all upper L2CAP modules. Maybe there is a problem in the
BNEP module or in the network layer.

Regards

Marcel




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