[PATCH AUTOSEL for 4.9 068/293] ixgbe: fix race condition with PTP_TX_IN_PROGRESS bits

From: Jacob Keller [ Upstream commit aaebaf50b502648b1d4d8c93b4be133944c2bbd0 ] Hardware related to the ixgbe driver is limited to handling a single Tx timestamp request at a time. Thus, the driver ignores requests for Tx timestamp while waiting for the current request

[PATCH AUTOSEL for 4.9 068/293] ixgbe: fix race condition with PTP_TX_IN_PROGRESS bits

From: Jacob Keller [ Upstream commit aaebaf50b502648b1d4d8c93b4be133944c2bbd0 ] Hardware related to the ixgbe driver is limited to handling a single Tx timestamp request at a time. Thus, the driver ignores requests for Tx timestamp while waiting for the current request to finish. It uses a