sfc_ef100: PHY probe stub

We can't actually do the MCDI to probe it fully until we have working
 MCDI, which comes later, but we need efx->phy_data to be allocated so
 that when we get MCDI events the link-state change handler doesn't
 NULL-dereference.
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/ef100_nic.c

@@ -77,6 +77,16 @@ static irqreturn_t ef100_msi_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+static int ef100_phy_probe(struct efx_nic *efx)
+{
+	/* stub: allocate the phy_data */
+	efx->phy_data = kzalloc(sizeof(struct efx_mcdi_phy_data), GFP_KERNEL);
+	if (!efx->phy_data)
+		return -ENOMEM;
+
+	return 0;
+}
+
 /*	Other
  */
 
@@ -193,6 +203,10 @@ static int ef100_probe_main(struct efx_nic *efx)
 
 	efx->max_vis = EF100_MAX_VIS;
 
+	rc = ef100_phy_probe(efx);
+	if (rc)
+		goto fail;
+
 	rc = efx_init_channels(efx);
 	if (rc)
 		goto fail;