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thread-pool: avoid deadlock in nested aio_poll() calls
The thread pool has a race condition if two elements complete before thread_pool_completion_bh() runs: If element A's callback waits for element B using aio_poll() it will deadlock since pool->completion_bh is not marked scheduled when the nested aio_poll() runs. Fix this by marking the BH scheduled while thread_pool_completion_bh() is executing. This way any nested aio_poll() loops will enter thread_pool_completion_bh() and complete the remaining elements. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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