[PATCH 10/25] spusched: fix null pointer dereference in find_victim

[Christoph Hellwig]

On Fri, Sep 14, 2007 at 04:32:54PM +1000, Jeremy Kerr wrote:
> From: Christoph Hellwig <hch at lst.de>
> 
> find_victim can dereference a NULL pointer when iterating over the list
> of victim spus because list_mutex only guarantees spu->ct to be stable,
> but of course not to be non-NULL.
> 
> Also fix find_victim to not call spu_unbind_context without list_mutex
> because that violates the above guarantee.

Didn't we want to try to get this into 2.6.23?  It's a quite emberassing
bug with a trivial fix.  And a regression vs 2.6.22.