ptp: introduce ptp_cancel_worker_sync
In order to effectively use the PTP kernel thread for tasks such as timestamping packets, allow the user control over stopping it, which is needed e.g. when the timestamping queues must be drained. Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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