powerpc/spufs: fix missed stop-and-signal event
There is a delay in the transition to the stopped state for class 2 interrupts. In some cases, the controlling thread detects the state of the spu as running, and goes back to sleep resulting in a hung application as the event is missed. This change detects the stop condition and re-generates the wakeup event after a context save. Signed-off-by: Luke Browning <lukebrowning@us.ibm.com> Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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@ -407,6 +407,8 @@ static int has_affinity(struct spu_context *ctx)
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*/
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static void spu_unbind_context(struct spu *spu, struct spu_context *ctx)
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{
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u32 status;
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spu_context_trace(spu_unbind_context__enter, ctx, spu);
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spuctx_switch_state(ctx, SPU_UTIL_SYSTEM);
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@ -452,6 +454,9 @@ static void spu_unbind_context(struct spu *spu, struct spu_context *ctx)
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/* This maps the underlying spu state to idle */
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spuctx_switch_state(ctx, SPU_UTIL_IDLE_LOADED);
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ctx->spu = NULL;
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if (spu_stopped(ctx, &status))
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wake_up_all(&ctx->stop_wq);
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}
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/**
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