netdev - unregister_netdev() deadlock

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Message-Id: <1204127094.11318.0.camel@vglwks010.vgl2.office.vaioni.com>
Date:	Wed, 27 Feb 2008 15:44:54 +0000
From:	Jeba Anandhan <jeba.anandhan@...oni.com>
To:	netdev@...r.kernel.org
Cc:	matthew.hattersley@...oni.com
Subject: unregister_netdev() deadlock

Hi all,
I have doubts about unregister the netdevice.

Scenario
I have two netdevice entities. I wish to unregister one entity.

struct net_device *dev1;
struct net_device *dev2;

dev1->timer = XXX;
dev2->timer = YYY;

dev1->ioctl() {

...
case delete_other:
            unregister_netdev(dev2);
            free_netdev(dev2);
            return 0;
...
}

The dev2->refcnt is not zero in this case. unregister_netdev(dev2) cause
deadlock. Could you tell me why it happens?.

It works smoothly when we call the unregister_netdev(dev2) from
cleanup_module(). dev2->refcnt is not zero in this case.  Still it is
able to unregister.

Thanks
Jeba

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