From: Jeremy Kerr <jk@ozlabs.org>
Date: Thu, 14 Aug 2008 04:59:12 +0000 (+1000)
Subject: powerpc/spufs: reference context while dropping state mutex in scheduler
X-Git-Tag: v2.6.27-rc4~31^2~3^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8d5636fbca202f61fdb808fc9e20c0142291d802;p=pandora-kernel.git

powerpc/spufs: reference context while dropping state mutex in scheduler

Based on an original patch from Christoph Hellwig <hch@lst.de>.

Currently, there is a possible reference-after-free in the spusched
code - contexts may be freed after we have released their state_mutex
in spusched_tick and find_victim.

This change takes a reference to the context before releasing the
mutex, so that the context doesn't get destroyed.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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