bnx2: Allow phy reset to be skipped during chip reset.

Andy Gospodarek <andy@greyhouse.net> found that netconsole would
panic when resetting bnx2 devices.

>From Andy:
"The issue is the bnx2_set_link in bnx2_init_nic will print a link-status
message before we are fully initialized and ready to start polling.
Polling is currently disabled in this state, but since the
__LINK_STATE_RX_SCHED is overloaded to not only try and disable polling
but also to make the system aware there is something waiting to be
polled, we really have to fix this in drivers.

The problematic call is the one to netif_rx_complete as it tries to
remove an entry from the poll_list when there isn't one."

While this netconsole problem should be fixed separately, we really
should not reset the PHY when changing ring sizes, MTU, or other
similar settings.  The PHY reset causes several seconds of unnecessary
link disruptions.
Signed-off-by: NMichael Chan <mchan@broadcom.com>
Acked-by: NAndy Gospodarek <andy@greyhouse.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/bnx2.c

@@ -1875,7 +1875,7 @@ bnx2_setup_phy(struct bnx2 *bp, u8 port)
 }
 
 static int
-bnx2_init_5709s_phy(struct bnx2 *bp)
+bnx2_init_5709s_phy(struct bnx2 *bp, int reset_phy)
 {
 	u32 val;
 
@@ -1890,7 +1890,8 @@ bnx2_init_5709s_phy(struct bnx2 *bp)
 	bnx2_write_phy(bp, MII_BNX2_AER_AER, MII_BNX2_AER_AER_AN_MMD);
 
 	bnx2_write_phy(bp, MII_BNX2_BLK_ADDR, MII_BNX2_BLK_ADDR_COMBO_IEEEB0);
-	bnx2_reset_phy(bp);
+	if (reset_phy)
+		bnx2_reset_phy(bp);
 
 	bnx2_write_phy(bp, MII_BNX2_BLK_ADDR, MII_BNX2_BLK_ADDR_SERDES_DIG);
 
@@ -1924,11 +1925,12 @@ bnx2_init_5709s_phy(struct bnx2 *bp)
 }
 
 static int
-bnx2_init_5708s_phy(struct bnx2 *bp)
+bnx2_init_5708s_phy(struct bnx2 *bp, int reset_phy)
 {
 	u32 val;
 
-	bnx2_reset_phy(bp);
+	if (reset_phy)
+		bnx2_reset_phy(bp);
 
 	bp->mii_up1 = BCM5708S_UP1;
 
@@ -1981,9 +1983,10 @@ bnx2_init_5708s_phy(struct bnx2 *bp)
 }
 
 static int
-bnx2_init_5706s_phy(struct bnx2 *bp)
+bnx2_init_5706s_phy(struct bnx2 *bp, int reset_phy)
 {
-	bnx2_reset_phy(bp);
+	if (reset_phy)
+		bnx2_reset_phy(bp);
 
 	bp->phy_flags &= ~BNX2_PHY_FLAG_PARALLEL_DETECT;
 
@@ -2018,11 +2021,12 @@ bnx2_init_5706s_phy(struct bnx2 *bp)
 }
 
 static int
-bnx2_init_copper_phy(struct bnx2 *bp)
+bnx2_init_copper_phy(struct bnx2 *bp, int reset_phy)
 {
 	u32 val;
 
-	bnx2_reset_phy(bp);
+	if (reset_phy)
+		bnx2_reset_phy(bp);
 
 	if (bp->phy_flags & BNX2_PHY_FLAG_CRC_FIX) {
 		bnx2_write_phy(bp, 0x18, 0x0c00);
@@ -2070,7 +2074,7 @@ bnx2_init_copper_phy(struct bnx2 *bp)
 
 
 static int
-bnx2_init_phy(struct bnx2 *bp)
+bnx2_init_phy(struct bnx2 *bp, int reset_phy)
 {
 	u32 val;
 	int rc = 0;
@@ -2096,14 +2100,14 @@ bnx2_init_phy(struct bnx2 *bp)
 
 	if (bp->phy_flags & BNX2_PHY_FLAG_SERDES) {
 		if (CHIP_NUM(bp) == CHIP_NUM_5706)
-			rc = bnx2_init_5706s_phy(bp);
+			rc = bnx2_init_5706s_phy(bp, reset_phy);
 		else if (CHIP_NUM(bp) == CHIP_NUM_5708)
-			rc = bnx2_init_5708s_phy(bp);
+			rc = bnx2_init_5708s_phy(bp, reset_phy);
 		else if (CHIP_NUM(bp) == CHIP_NUM_5709)
-			rc = bnx2_init_5709s_phy(bp);
+			rc = bnx2_init_5709s_phy(bp, reset_phy);
 	}
 	else {
-		rc = bnx2_init_copper_phy(bp);
+		rc = bnx2_init_copper_phy(bp, reset_phy);
 	}
 
 setup_phy:
@@ -4873,7 +4877,7 @@ bnx2_reset_nic(struct bnx2 *bp, u32 reset_code)
 }
 
 static int
-bnx2_init_nic(struct bnx2 *bp)
+bnx2_init_nic(struct bnx2 *bp, int reset_phy)
 {
 	int rc;
 
@@ -4881,7 +4885,7 @@ bnx2_init_nic(struct bnx2 *bp)
 		return rc;
 
 	spin_lock_bh(&bp->phy_lock);
-	bnx2_init_phy(bp);
+	bnx2_init_phy(bp, reset_phy);
 	bnx2_set_link(bp);
 	if (bp->phy_flags & BNX2_PHY_FLAG_REMOTE_PHY_CAP)
 		bnx2_remote_phy_event(bp);
@@ -5269,7 +5273,7 @@ bnx2_test_loopback(struct bnx2 *bp)
 
 	bnx2_reset_nic(bp, BNX2_DRV_MSG_CODE_RESET);
 	spin_lock_bh(&bp->phy_lock);
-	bnx2_init_phy(bp);
+	bnx2_init_phy(bp, 1);
 	spin_unlock_bh(&bp->phy_lock);
 	if (bnx2_run_loopback(bp, BNX2_MAC_LOOPBACK))
 		rc |= BNX2_MAC_LOOPBACK_FAILED;
@@ -5659,7 +5663,7 @@ bnx2_open(struct net_device *dev)
 		return rc;
 	}
 
-	rc = bnx2_init_nic(bp);
+	rc = bnx2_init_nic(bp, 1);
 
 	if (rc) {
 		bnx2_napi_disable(bp);
@@ -5691,7 +5695,7 @@ bnx2_open(struct net_device *dev)
 
 			bnx2_setup_int_mode(bp, 1);
 
-			rc = bnx2_init_nic(bp);
+			rc = bnx2_init_nic(bp, 0);
 
 			if (!rc)
 				rc = bnx2_request_irq(bp);
@@ -5727,7 +5731,7 @@ bnx2_reset_task(struct work_struct *work)
 	bp->in_reset_task = 1;
 	bnx2_netif_stop(bp);
 
-	bnx2_init_nic(bp);
+	bnx2_init_nic(bp, 1);
 
 	atomic_set(&bp->intr_sem, 1);
 	bnx2_netif_start(bp);
@@ -6421,7 +6425,7 @@ bnx2_set_coalesce(struct net_device *dev, struct ethtool_coalesce *coal)
 
 	if (netif_running(bp->dev)) {
 		bnx2_netif_stop(bp);
-		bnx2_init_nic(bp);
+		bnx2_init_nic(bp, 0);
 		bnx2_netif_start(bp);
 	}
 
@@ -6464,7 +6468,7 @@ bnx2_change_ring_size(struct bnx2 *bp, u32 rx, u32 tx)
 		rc = bnx2_alloc_mem(bp);
 		if (rc)
 			return rc;
-		bnx2_init_nic(bp);
+		bnx2_init_nic(bp, 0);
 		bnx2_netif_start(bp);
 	}
 	return 0;
@@ -6732,7 +6736,7 @@ bnx2_self_test(struct net_device *dev, struct ethtool_test *etest, u64 *buf)
 			bnx2_reset_chip(bp, BNX2_DRV_MSG_CODE_RESET);
 		}
 		else {
-			bnx2_init_nic(bp);
+			bnx2_init_nic(bp, 1);
 			bnx2_netif_start(bp);
 		}
 
@@ -7619,7 +7623,7 @@ bnx2_resume(struct pci_dev *pdev)
 
 	bnx2_set_power_state(bp, PCI_D0);
 	netif_device_attach(dev);
-	bnx2_init_nic(bp);
+	bnx2_init_nic(bp, 1);
 	bnx2_netif_start(bp);
 	return 0;
 }