netpoll again ? (was: Re: 2.6.20-git14 rtl8139 possible circular locking dependency detected)

Francois Romieu [off-list ref] :

Michal Piotrowski [off-list ref] :
[...]

Did you enable RTL8139_DEBUG ?

If so you can try the patch below.

It's buggy there too but you are not experiencing this one.

1 - netpoll() calls the poll() handler of the device through netpoll_poll()
2 - The poll handler of the device tries to acquire dev->_xmit_lock
    through dev_mc_add during the Rx protocol processing
3 - netpoll() holds dev->_xmit_lock to avoid recursion in netpoll_poll()

#2 and #3 have opposite requirements.

-- 
Ueimor