[PATCH AUTOSEL for 4.4 034/162] ixgbe: avoid permanent lock of *_PTP_TX_IN_PROGRESS

From: Jacob Keller [ Upstream commit 5fef124d9c75942dc5c2445a3faa8ad37cbf4c82 ] The ixgbe driver uses a state bit lock to avoid handling more than one Tx timestamp request at once. This is required because hardware is limited to a single set of registers for Tx

[PATCH AUTOSEL for 4.4 034/162] ixgbe: avoid permanent lock of *_PTP_TX_IN_PROGRESS

From: Jacob Keller [ Upstream commit 5fef124d9c75942dc5c2445a3faa8ad37cbf4c82 ] The ixgbe driver uses a state bit lock to avoid handling more than one Tx timestamp request at once. This is required because hardware is limited to a single set of registers for Tx timestamps. The state bit lock