3 files changed, 42 insertions, 1 deletions

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 3e86e6e0f778..8d52b23348bd 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -1599,6 +1599,7 @@ struct property *of_find_property(const struct device_node *np,
 
 	return pp;
 }
+EXPORT_SYMBOL(of_find_property);
 
 /*
  * Find a property with a given name for a given node
diff --git a/arch/powerpc/kernel/prom_parse.c b/arch/powerpc/kernel/prom_parse.c
index 12c51e4ad2b4..ea6fd552c7ea 100644
--- a/arch/powerpc/kernel/prom_parse.c
+++ b/arch/powerpc/kernel/prom_parse.c
@@ -5,6 +5,7 @@
 #include <linux/pci_regs.h>
 #include <linux/module.h>
 #include <linux/ioport.h>
+#include <linux/etherdevice.h>
 #include <asm/prom.h>
 #include <asm/pci-bridge.h>
 
@@ -1003,3 +1004,42 @@ int of_irq_map_one(struct device_node *device, int index, struct of_irq *out_irq
 	return res;
 }
 EXPORT_SYMBOL_GPL(of_irq_map_one);
+
+/**
+ * Search the device tree for the best MAC address to use.  'mac-address' is
+ * checked first, because that is supposed to contain to "most recent" MAC
+ * address. If that isn't set, then 'local-mac-address' is checked next,
+ * because that is the default address.  If that isn't set, then the obsolete
+ * 'address' is checked, just in case we're using an old device tree.
+ *
+ * Note that the 'address' property is supposed to contain a virtual address of
+ * the register set, but some DTS files have redefined that property to be the
+ * MAC address.
+ *
+ * All-zero MAC addresses are rejected, because those could be properties that
+ * exist in the device tree, but were not set by U-Boot.  For example, the
+ * DTS could define 'mac-address' and 'local-mac-address', with zero MAC
+ * addresses.  Some older U-Boots only initialized 'local-mac-address'.  In
+ * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
+ * but is all zeros.
+*/
+const void *of_get_mac_address(struct device_node *np)
+{
+	struct property *pp;
+
+	pp = of_find_property(np, "mac-address", NULL);
+	if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
+		return pp->value;
+
+	pp = of_find_property(np, "local-mac-address", NULL);
+	if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
+		return pp->value;
+
+	pp = of_find_property(np, "address", NULL);
+	if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
+		return pp->value;
+
+	return NULL;
+}
+EXPORT_SYMBOL(of_get_mac_address);
+
diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
index 76b5d7ebdcc6..9d0735a54564 100644
--- a/arch/powerpc/kernel/rtas.c
+++ b/arch/powerpc/kernel/rtas.c
@@ -182,7 +182,7 @@ void rtas_progress(char *s, unsigned short hex)
 	char *os;
 	static int display_character, set_indicator;
 	static int display_width, display_lines, form_feed;
-	const static int *row_width;
+	static const int *row_width;
 	static DEFINE_SPINLOCK(progress_lock);
 	static int current_line;
 	static int pending_newline = 0;  /* did last write end with unprinted newline? */