Merge branch 'mlxsw-fixes'

Petr Machata says:

====================
mlxsw: Fixes for PTP support

This set fixes several issues in mlxsw PTP code.

- Patch #1 fixes compilation warnings.

- Patch #2 adjusts the order of operation during cleanup, thereby
  closing the window after PTP state was already cleaned in the ASIC
  for the given port, but before the port is removed, when the user
  could still in theory make changes to the configuration.

- Patch #3 protects the PTP configuration with a custom mutex, instead
  of relying on RTNL, which is not held in all access paths.

- Patch #4 forbids enablement of PTP only in RX or only in TX. The
  driver implicitly assumed this would be the case, but neglected to
  sanitize the configuration.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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