[POWERPC] spufs: remove woken threads from the runqueue early

A single context should only be woken once, and we should not have
more wakeups for a given priority than the number of contexts on
that runqueue position.

Also add some asserts to trap future problems in this area more
easily.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/context.c b/arch/powerpc/platforms/cell/spufs/context.c
index b3954aba424..065147fb1cc 100644
--- a/arch/powerpc/platforms/cell/spufs/context.c
+++ b/arch/powerpc/platforms/cell/spufs/context.c
@@ -52,6 +52,7 @@ struct spu_context *alloc_spu_context(struct spu_gang *gang)
         ctx->state = SPU_STATE_SAVED;
         ctx->ops = &spu_backing_ops;
         ctx->owner = get_task_mm(current);
+        INIT_LIST_HEAD(&ctx->rq);
         if (gang)
                 spu_gang_add_ctx(gang, ctx);
         ctx->rt_priority = current->rt_priority;
@@ -76,6 +77,7 @@ void destroy_spu_context(struct kref *kref)
         spu_fini_csa(&ctx->csa);
         if (ctx->gang)
                 spu_gang_remove_ctx(ctx->gang, ctx);
+        BUG_ON(!list_empty(&ctx->rq));
         kfree(ctx);
 }