netdev - Re: [Bugme-new] [Bug 8638] New: unregister_netdevice: waiting for ppp0 to become free. pppoe + multihome + htb qos?

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Message-Id: <20070618082331.d1b7fd93.akpm@linux-foundation.org>
Date:	Mon, 18 Jun 2007 08:23:31 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Chuck Ebbert <cebbert@...hat.com>
Cc:	netdev@...r.kernel.org,
	"bugme-daemon@...nel-bugs.osdl.org" 
	<bugme-daemon@...nel-bugs.osdl.org>,
	Paul Mackerras <paulus@...ba.org>, kernelbugs@...nopolis.ca
Subject: Re: [Bugme-new] [Bug 8638] New: unregister_netdevice: waiting for
 ppp0 to become free. pppoe + multihome + htb qos?

On Mon, 18 Jun 2007 10:56:06 -0400 Chuck Ebbert <cebbert@...hat.com> wrote:

> 
> Is there any way to print the addresses the notifier is calling
> to try and release net device references? I see:
> 
> net/core/dev/c::netdev_wait_allrefs():
> 
>         while (atomic_read(&dev->refcnt) != 0) {
>                 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
>                         rtnl_lock();
> 
>                         /* Rebroadcast unregister notification */
>                         raw_notifier_call_chain(&netdev_chain,
>                                             NETDEV_UNREGISTER, dev);
> 
> but don't see any way to print the functions that get called.

Nope.  I guess we could add some print_notifier_call_chain() thing, but
then we'd need one flavour per locking scheme and it would get ridiculous.

I guess just an unlocked version would be OK - it's just a debug thing.
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