net: enetc: make enetc_refill_rx_ring update the consumer index

Since commit fd5736b ("enetc: Workaround for MDIO register access
issue"), enetc_refill_rx_ring no longer updates the RX BD ring's
consumer index, that is left to be done by the caller. This has led to
bugs such as the ones found in 96a5223 ("net: enetc: remove bogus
write to SIRXIDR from enetc_setup_rxbdr") and 3a5d12c ("net: enetc:
keep RX ring consumer index in sync with hardware"), so it is desirable
that we move back the update of the consumer index into enetc_refill_rx_ring.

The trouble with that is the different MDIO locking context for the two
callers of enetc_refill_rx_ring:

- enetc_clean_rx_ring runs under enetc_lock_mdio()
- enetc_setup_rxbdr runs outside enetc_lock_mdio()

Simplify the callers of enetc_refill_rx_ring by making enetc_setup_rxbdr
explicitly take enetc_lock_mdio() around the call. It will be the only
place in need of ensuring the hot accessors can be used.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/enetc/enetc.c

@@ -435,6 +435,9 @@ static int enetc_refill_rx_ring(struct enetc_bdr *rx_ring, const int buff_cnt)
 	if (likely(j)) {
 		rx_ring->next_to_alloc = i; /* keep track from page reuse */
 		rx_ring->next_to_use = i;
+
+		/* update ENETC's consumer index */
+		enetc_wr_reg_hot(rx_ring->rcir, rx_ring->next_to_use);
 	}
 
 	return j;
@@ -620,13 +623,9 @@ static int enetc_clean_rx_ring(struct enetc_bdr *rx_ring,
 		u32 bd_status;
 		u16 size;
 
-		if (cleaned_cnt >= ENETC_RXBD_BUNDLE) {
-			int count = enetc_refill_rx_ring(rx_ring, cleaned_cnt);
-
-			/* update ENETC's consumer index */
-			enetc_wr_reg_hot(rx_ring->rcir, rx_ring->next_to_use);
-			cleaned_cnt -= count;
-		}
+		if (cleaned_cnt >= ENETC_RXBD_BUNDLE)
+			cleaned_cnt -= enetc_refill_rx_ring(rx_ring,
+							    cleaned_cnt);
 
 		rxbd = enetc_rxbd(rx_ring, i);
 		bd_status = le32_to_cpu(rxbd->r.lstatus);
@@ -1118,9 +1117,9 @@ static void enetc_setup_rxbdr(struct enetc_hw *hw, struct enetc_bdr *rx_ring)
 	rx_ring->rcir = hw->reg + ENETC_BDR(RX, idx, ENETC_RBCIR);
 	rx_ring->idr = hw->reg + ENETC_SIRXIDR;
 
+	enetc_lock_mdio();
 	enetc_refill_rx_ring(rx_ring, enetc_bd_unused(rx_ring));
-	/* update ENETC's consumer index */
-	enetc_rxbdr_wr(hw, idx, ENETC_RBCIR, rx_ring->next_to_use);
+	enetc_unlock_mdio();
 
 	/* enable ring */
 	enetc_rxbdr_wr(hw, idx, ENETC_RBMR, rbmr);