Re: some missing spin_unlocks

[David S. Miller]

From: Arjan van de Ven <arjan@xxxxxxxxxxxxx>
Subject: Re: some missing spin_unlocks
Date: Tue, 23 Aug 2005 19:40:06 +0200

> On Tue, 2005-08-23 at 10:30 -0700, David S. Miller wrote:
> > From: Arjan van de Ven <arjan@xxxxxxxxxxxxx>
> > Date: Tue, 23 Aug 2005 18:54:03 +0200
> > 
> > > does it matter? can ANYTHING be spinning on the lock? if not .. can we
> > > just let the lock go poof and not unlock it... 
> > 
> > I believe socket lookup can, otherwise the code is OK as-is.
> 
> lookup while the object is in progress of being destroyed sounds really
> bad though....

This happens all the time with TCP sockets, for example.
When we're trying to kill off a socket which is in time
wait state, the receive path can find it, grab a reference,
and process a packet against it right as we're trying to
kill it off.

This is completely normal.
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