net: sync env ethaddr to device enetaddr in eth_init()

In the previous enetaddr refactoring, the assumption with commit 56b555a6
was that the eth layer would handle the env -> device enetaddr syncing.
This was not the case as eth_initialize() is called only once and the sync
occurs there.  So make sure the eth_init() function does the env -> device
sync with every network init.

Reported-by: Andrzej Wolski <awolski@poczta.fm>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

include/net.h

@@ -119,10 +119,10 @@ extern struct eth_device *eth_get_dev(void);	/* get the current device MAC */
 extern struct eth_device *eth_get_dev_by_name(char *devname); /* get device */
 extern struct eth_device *eth_get_dev_by_index(int index); /* get dev @ index */
 extern int eth_get_dev_index (void);		/* get the device index */
-extern void eth_set_enetaddr(int num, char* a);	/* Set new MAC address */
 extern void eth_parse_enetaddr(const char *addr, uchar *enetaddr);
 extern int eth_getenv_enetaddr(char *name, uchar *enetaddr);
 extern int eth_setenv_enetaddr(char *name, const uchar *enetaddr);
+extern int eth_getenv_enetaddr_by_index(int index, uchar *enetaddr);
 
 extern int eth_init(bd_t *bis);			/* Initialize the device */
 extern int eth_send(volatile void *packet, int length);	   /* Send a packet */

net/eth.c

@@ -53,6 +53,13 @@ int eth_setenv_enetaddr(char *name, const uchar *enetaddr)
 
 	return setenv(name, buf);
 }
+
+int eth_getenv_enetaddr_by_index(int index, uchar *enetaddr)
+{
+	char enetvar[32];
+	sprintf(enetvar, index ? "eth%daddr" : "ethaddr", index);
+	return eth_getenv_enetaddr(enetvar, enetaddr);
+}
 #endif
 
 #if defined(CONFIG_CMD_NET) && defined(CONFIG_NET_MULTI)
@@ -180,7 +187,6 @@ int eth_register(struct eth_device* dev)
 
 int eth_initialize(bd_t *bis)
 {
-	char enetvar[32];
 	unsigned char env_enetaddr[6];
 	int eth_number = 0;
 
@@ -221,8 +227,7 @@ int eth_initialize(bd_t *bis)
 				puts (" [PRIME]");
 			}
 
-			sprintf(enetvar, eth_number ? "eth%daddr" : "ethaddr", eth_number);
-			eth_getenv_enetaddr(enetvar, env_enetaddr);
+			eth_getenv_enetaddr_by_index(eth_number, env_enetaddr);
 
 			if (memcmp(env_enetaddr, "\0\0\0\0\0\0", 6)) {
 				if (memcmp(dev->enetaddr, "\0\0\0\0\0\0", 6) &&
@@ -259,31 +264,6 @@ int eth_initialize(bd_t *bis)
 	return eth_number;
 }
 
-void eth_set_enetaddr(int num, char *addr) {
-	struct eth_device *dev;
-	unsigned char enetaddr[6];
-
-	debug("eth_set_enetaddr(num=%d, addr=%s)\n", num, addr);
-
-	if (!eth_devices)
-		return;
-
-	eth_parse_enetaddr(addr, enetaddr);
-
-	dev = eth_devices;
-	while(num-- > 0) {
-		dev = dev->next;
-
-		if (dev == eth_devices)
-			return;
-	}
-
-	debug("Setting new HW address on %s\n"
-		"New Address is             %pM\n",
-		dev->name, enetaddr);
-
-	memcpy(dev->enetaddr, enetaddr, 6);
-}
 #ifdef CONFIG_MCAST_TFTP
 /* Multicast.
  * mcast_addr: multicast ipaddr from which multicast Mac is made
@@ -332,13 +312,27 @@ u32 ether_crc (size_t len, unsigned char const *p)
 
 int eth_init(bd_t *bis)
 {
-	struct eth_device* old_current;
+	int eth_number;
+	struct eth_device *old_current, *dev;
 
 	if (!eth_current) {
 		puts ("No ethernet found.\n");
 		return -1;
 	}
 
+	/* Sync environment with network devices */
+	eth_number = 0;
+	dev = eth_devices;
+	do {
+		uchar env_enetaddr[6];
+
+		if (eth_getenv_enetaddr_by_index(eth_number, env_enetaddr))
+			memcpy(dev->enetaddr, env_enetaddr, 6);
+
+		++eth_number;
+		dev = dev->next;
+	} while (dev != eth_devices);
+
 	old_current = eth_current;
 	do {
 		debug("Trying %s\n", eth_current->name);