sis190: read the mac address from the eeprom first

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: Francois Romieu <romieu@xxxxxxxxxxxxx>

upstream commit: 563e0ae06ff18f0b280f11cf706ba0172255ce52

Reading a serie of zero from the cmos sram area do not work
well with is_valid_ether_addr(). Let's read the mac address
from the eeprom first as it seems more reliable.

Fix for http://bugzilla.kernel.org/show_bug.cgi?id=9831

Signed-off-by: Francois Romieu <romieu@xxxxxxxxxxxxx>
Signed-off-by: Jeff Garzik <jeff@xxxxxxxxxx>

dsd@xxxxxxxxxx notes:
This patch fixes http://bugs.gentoo.org/207706

Cc: Daniel Drake <dsd@xxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---
 drivers/net/sis190.c |   15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

--- a/drivers/net/sis190.c
+++ b/drivers/net/sis190.c
@@ -1632,13 +1632,18 @@ static inline void sis190_init_rxfilter(
 
 static int sis190_get_mac_addr(struct pci_dev *pdev, struct net_device *dev)
 {
-	u8 from;
+	int rc;
+
+	rc = sis190_get_mac_addr_from_eeprom(pdev, dev);
+	if (rc < 0) {
+		u8 reg;
 
-	pci_read_config_byte(pdev, 0x73, &from);
+		pci_read_config_byte(pdev, 0x73, &reg);
 
-	return (from & 0x00000001) ?
-		sis190_get_mac_addr_from_apc(pdev, dev) :
-		sis190_get_mac_addr_from_eeprom(pdev, dev);
+		if (reg & 0x00000001)
+			rc = sis190_get_mac_addr_from_apc(pdev, dev);
+	}
+	return rc;
 }
 
 static void sis190_set_speed_auto(struct net_device *dev)

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