netdev - Re: [irda-users] [2.6.20-rt8] "Neighbour table overflow."

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Message-ID: <17927.7070.803210.600520@cargo.ozlabs.ibm.com>
Date:	Mon, 26 Mar 2007 11:02:22 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	David Miller <davem@...emloft.net>
Cc:	gl@...-ac.de, samuel@...tiz.org, irda-users@...ts.sourceforge.net,
	netdev@...r.kernel.org
Subject: Re: [irda-users] [2.6.20-rt8] "Neighbour table overflow."

David Miller writes:

> The PPP generic layer seems to be very careful about it's handling of
> the ->xmit_pending packet.

Mostly, but I think that this is a genuine leak.

> I'm really surprised this leak doesn't trigger already via the
> ppp_synctty.c and ppp_async.c drivers, perhaps they do something to
> make sure the transmitter gets purged properly when unregistering and
> therefore ->xmit_pending does not get left non-NULL at unregister
> time.

At least for ppp_async, I think what saves us is that pppd does a
TCFLSH ioctl when shutting down the link, which calls
ppp_async_flush_output, which calls ppp_output_wakeup.

Paul.
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