mlx4_en: Only cycle port if HW timestamp config changes
If the hwtstamp_config matches what is currently set for the device then simply return. Without this change any program that tries to enable hardware timestamps will cause the link to cycle even if hardware timstamps were already enabled. Signed-off-by: NShawn Bohrer <sbohrer@rgmadvisors.com> Acked-By: NHadar Hen Zion <hadarh@mellanox.com> Acked-by: NRichard Cochran <richardcochran@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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