e1000e: PTP lock in e1000e_phc_adjustfreq
Add lock in e1000e_phc_adjfreq to prevent concurrent changes to TIMINCA and SYSTIMH/L. Signed-off-by: NTodd Fujinaka <todd.fujinaka@intel.com> Tested-by: NJeff Pieper <jeffrey.e.pieper@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
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