@@ -319,6 +319,7 @@ struct igc_adapter {
struct timespec64 prev_ptp_time; /* Pre-reset PTP clock */
ktime_t ptp_reset_start; /* Reset time in clock mono */
struct system_time_snapshot snapshot;
+ struct mutex ptm_lock; /* Only allow one PTM transaction at a time */
char fw_version[32];
@@ -1068,9 +1068,16 @@ static int igc_ptp_getcrosststamp(struct ptp_clock_info *ptp,
{
struct igc_adapter *adapter = container_of(ptp, struct igc_adapter,
ptp_caps);
+ int ret;
- return get_device_system_crosststamp(igc_phc_get_syncdevicetime,
- adapter, &adapter->snapshot, cts);
+ /* This blocks until any in progress PTM transactions complete */
+ mutex_lock(&adapter->ptm_lock);
+
+ ret = get_device_system_crosststamp(igc_phc_get_syncdevicetime,
+ adapter, &adapter->snapshot, cts);
+ mutex_unlock(&adapter->ptm_lock);
+
+ return ret;
}
static int igc_ptp_getcyclesx64(struct ptp_clock_info *ptp,
@@ -1169,6 +1176,7 @@ void igc_ptp_init(struct igc_adapter *adapter)
spin_lock_init(&adapter->ptp_tx_lock);
spin_lock_init(&adapter->free_timer_lock);
spin_lock_init(&adapter->tmreg_lock);
+ mutex_init(&adapter->ptm_lock);
adapter->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
adapter->tstamp_config.tx_type = HWTSTAMP_TX_OFF;