[TG3]: Fix Sun tg3 variant detection.

Some Sun parts don't have PCI_VENDOR_ID_SUN in the subsystem
vendor ID.  So add another fallback test, which is the name
of the OBP firmware device tree node.  If it's a Sun part we'll
get "network", else it will be named "ethernet".

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index e7dc653..e8e92c8 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -9408,6 +9408,15 @@
 			return 0;
 		if (venid == PCI_VENDOR_ID_SUN)
 			return 1;
+
+		/* TG3 chips onboard the SunBlade-2500 don't have the
+		 * subsystem-vendor-id set to PCI_VENDOR_ID_SUN but they
+		 * are distinguishable from non-Sun variants by being
+		 * named "network" by the firmware.  Non-Sun cards will
+		 * show up as being named "ethernet".
+		 */
+		if (!strcmp(pcp->prom_name, "network"))
+			return 1;
 	}
 	return 0;
 }