diff --git a/drivers/net/ethernet/micrel/ks8851_common.c b/drivers/net/ethernet/micrel/ks8851_common.c
index 3b59bf15b..5e58e5238 100755
--- a/drivers/net/ethernet/micrel/ks8851_common.c
+++ b/drivers/net/ethernet/micrel/ks8851_common.c
@@ -500,6 +500,7 @@ static int ks8851_net_open(struct net_device *dev)
 	ks8851_wrreg16(ks, KS_IER, ks->rc_ier);
 
 	ks->queued_len = 0;
+	ks->tx_space = ks8851_rdreg16(ks, KS_TXMIR);
 	netif_start_queue(ks->netdev);
 
 	netif_dbg(ks, ifup, ks->netdev, "network device up\n");
@@ -1056,7 +1057,6 @@ int ks8851_probe_common(struct net_device *netdev, struct device *dev,
 	int ret;
 
 	ks->netdev = netdev;
-	ks->tx_space = 6144;
 
 	gpio = of_get_named_gpio_flags(dev->of_node, "reset-gpios", 0, NULL);
 	if (gpio == -EPROBE_DEFER)