From: Jeremy Kerr <jk@ozlabs.org>
Date: Wed, 27 Feb 2008 08:08:13 +0000 (+1100)
Subject: [POWERPC] spufs: fix invalid scheduling of forgotten contexts
X-Git-Tag: v2.6.25-rc4~120^2~1^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0111a701867a796a7ca6ecbc385e4befc9f35066;p=pandora-kernel.git

[POWERPC] spufs: fix invalid scheduling of forgotten contexts

At present, we have a situation where a context with no owner is
re-scheduled by spu_forget:

	Thread 1: reading regs file	Thread 2: context owner

					spu_forget()
						- ctx->owner = NULL
						- set SPU_SCHED_WAS_ACTIVE

	spu_acquire_saved()
	- context is in saved state

	spu_release_saved()
	- SPU_SCHED_WAS_ACTIVE is set,
	  so spu_activate() the context,
	  which now has no owner

In spu_forget(), we shouldn't be requesting a re-schedule by setting
SPU_SCHED_WAS_ACTIVE. This change removes the set_bit in spu_forget(),
so that spu_release_saved() doesn't reinsert this destroyed context on
to the run queue.

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

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