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Pekka Enberg authored
In preparation for threaded execution, make 8250 code thread safe by introducing a per-device mutex. Cc: Asias He <asias.hejun@gmail.com> Cc: Cyrill Gorcunov <gorcunov@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Pekka Enberg <penberg@kernel.org>
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