openwrt/target/linux/kirkwood/patches-3.10/0029-net-mv643xx_eth-do-not-use-port-number-as-platform-d.patch

From dc4eff91629aa5132f9c0737ef6d9ef013d4f8ce Mon Sep 17 00:00:00 2001
From: Jonas Gorski <jogo@openwrt.org>
Date: Mon, 8 Jul 2013 00:44:55 +0200
Subject: [PATCH 29/29] net: mv643xx_eth: do not use port number as platform
 device id

The port number is only local to the ethernet block, not global, so
there can be two ethernet blocks both using the same port, like
kirkwood with both using port 0.

Fix this by using the array index offset for the allocated platform
devices as the id.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/ethernet/marvell/mv643xx_eth.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/marvell/mv643xx_eth.c
+++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
@@ -2482,6 +2482,7 @@ static int mv643xx_eth_shared_of_add_por
 	struct resource res;
 	const char *mac_addr;
 	int ret;
+	int dev_num = 0;
 
 	memset(&ppd, 0, sizeof(ppd));
 	ppd.shared = pdev;
@@ -2502,6 +2503,14 @@ static int mv643xx_eth_shared_of_add_por
 		return -EINVAL;
 	}
 
+	while (dev_num < 3 && port_platdev[dev_num])
+		dev_num++;
+
+	if (dev_num == 3) {
+		dev_err(&pdev->dev, "too many ports registered\n");
+		return -EINVAL;
+	}
+
 	mac_addr = of_get_mac_address(pnp);
 	if (mac_addr)
 		memcpy(ppd.mac_addr, mac_addr, 6);
@@ -2520,7 +2529,7 @@ static int mv643xx_eth_shared_of_add_por
 		of_property_read_u32(pnp, "duplex", &ppd.duplex);
 	}
 
-	ppdev = platform_device_alloc(MV643XX_ETH_NAME, ppd.port_number);
+	ppdev = platform_device_alloc(MV643XX_ETH_NAME, dev_num);
 	if (!ppdev)
 		return -ENOMEM;
 	ppdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
@@ -2537,7 +2546,7 @@ static int mv643xx_eth_shared_of_add_por
 	if (ret)
 		goto port_err;
 
-	port_platdev[ppd.port_number] = ppdev;
+	port_platdev[dev_num] = ppdev;
 
 	return 0;