Synchronise access to the ring buffer pool
We need to synchronise access to the ring buffer pool in order to avoid concurrency bugs as multiple threads can mutate the state of the ring buffer and if we do not serialise these changes then they can result in errors.
Change-Id: If96e1707716370bcf57416cd505d16aa75c0d68c Signed-off-by: Dennis Tsiang dennis.tsiang@arm.com