drivers/net: Remove CONFIG_WIZNET_TX_FLOW option

This option was there for debugging race conditions,
just remove it, and assume TX_FLOW is always enabled.
Signed-off-by: Mike Sinkovsky <msink@permonline.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/wiznet/Kconfig

@@ -70,12 +70,4 @@ config WIZNET_BUS_ANY
 	  Performance may decrease compared to explicitly selected bus mode.
 endchoice
 
-config WIZNET_TX_FLOW
-	bool "Use transmit flow control"
-	depends on WIZNET_W5100 || WIZNET_W5300
-	default y
-	help
-	  This enables transmit flow control for WIZnet chips.
-	  If unsure, say Y.
-
 endif # NET_VENDOR_WIZNET

drivers/net/ethernet/wiznet/w5100.c

@@ -441,7 +441,6 @@ static int w5100_start_tx(struct sk_buff *skb, struct net_device *ndev)
 	struct w5100_priv *priv = netdev_priv(ndev);
 	u16 offset;
 
-	if (IS_ENABLED(CONFIG_WIZNET_TX_FLOW))
 	netif_stop_queue(ndev);
 
 	offset = w5100_read16(priv, W5100_S0_TX_WR);
@@ -517,7 +516,7 @@ static irqreturn_t w5100_interrupt(int irq, void *ndev_instance)
 	w5100_write(priv, W5100_S0_IR, ir);
 	mmiowb();
 
-	if (IS_ENABLED(CONFIG_WIZNET_TX_FLOW) && (ir & S0_IR_SENDOK)) {
+	if (ir & S0_IR_SENDOK) {
 		netif_dbg(priv, tx_done, ndev, "tx done\n");
 		netif_wake_queue(ndev);
 	}

drivers/net/ethernet/wiznet/w5300.c

@@ -273,9 +273,7 @@ static void w5300_hw_start(struct w5300_priv *priv)
 			  S0_MR_MACRAW : S0_MR_MACRAW_MF);
 	mmiowb();
 	w5300_command(priv, S0_CR_OPEN);
-	w5300_write(priv, W5300_S0_IMR, IS_ENABLED(CONFIG_WIZNET_TX_FLOW) ?
-					S0_IR_RECV | S0_IR_SENDOK :
-					S0_IR_RECV);
+	w5300_write(priv, W5300_S0_IMR, S0_IR_RECV | S0_IR_SENDOK);
 	w5300_write(priv, W5300_IMR, IR_S0);
 	mmiowb();
 }
@@ -371,7 +369,6 @@ static int w5300_start_tx(struct sk_buff *skb, struct net_device *ndev)
 {
 	struct w5300_priv *priv = netdev_priv(ndev);
 
-	if (IS_ENABLED(CONFIG_WIZNET_TX_FLOW))
 	netif_stop_queue(ndev);
 
 	w5300_write_frame(priv, skb->data, skb->len);
@@ -439,7 +436,7 @@ static irqreturn_t w5300_interrupt(int irq, void *ndev_instance)
 	w5300_write(priv, W5300_S0_IR, ir);
 	mmiowb();
 
-	if (IS_ENABLED(CONFIG_WIZNET_TX_FLOW) && (ir & S0_IR_SENDOK)) {
+	if (ir & S0_IR_SENDOK) {
 		netif_dbg(priv, tx_done, ndev, "tx done\n");
 		netif_wake_queue(ndev);
 	}