[PATCH] pcnet32 compilation fix for 2.4.3pre6

[Jeff Garzik <jgarzik@mandrakesoft.com>]

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hmm, on second thought, I think I would prefer the attached patch
(compiled but not tested).

Hardware usually returns all 1's when it's not present, or not working,
so think checking for addresses filled with 1's is a good idea too.

I also took the patch from alan's tree and made the memcmp against
six-byte 'zaddr' rather than a seven-byte string :)

-- 
Jeff Garzik       | May you have warm words on a cold evening,
Building 1024     | a full mooon on a dark night,
MandrakeSoft      | and a smooth road all the way to your door.

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Index: include/linux/etherdevice.h
===================================================================
RCS file: /cvsroot/gkernel/linux_2_4/include/linux/etherdevice.h,v
retrieving revision 1.1.1.14.4.2
diff -u -r1.1.1.14.4.2 etherdevice.h
--- include/linux/etherdevice.h	2001/03/21 14:10:50	1.1.1.14.4.2
+++ include/linux/etherdevice.h	2001/03/22 13:37:15
@@ -46,6 +46,25 @@
 	memcpy (dest->data, src, len);
 }
 
+/**
+ * is_valid_ether_addr - Determine if the given Ethernet address is valid
+ * @addr: Pointer to a six-byte array containing the Ethernet address
+ *
+ * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
+ * a multicast address, and is not FF:FF:FF:FF:FF:FF.
+ *
+ * Return true if the address is valid.
+ */
+static inline int is_valid_ether_addr( u8 *addr )
+{
+	const char zaddr[6] = {0,};
+	const char faddr[6] = {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF};
+
+	return !(addr[0]&1) &&
+	       memcmp( addr, zaddr, 6) &&
+	       memcmp( addr, faddr, 6);
+}
+
 #endif
 
 #endif	/* _LINUX_ETHERDEVICE_H */