macsonic: fix crash on PowerBook 520
No-one seems to know where the PowerBook 500 series store their ethernet
MAC addresses. So, rather than crash, use a MAC address from the SONIC
CAM. Failing that, generate a random one.
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/macsonic.c b/drivers/net/macsonic.c
index 61eabca..b3d7d8d 100644
--- a/drivers/net/macsonic.c
+++ b/drivers/net/macsonic.c
@@ -223,69 +223,73 @@
return 0;
}
-static int __devinit mac_onboard_sonic_ethernet_addr(struct net_device *dev)
+#define INVALID_MAC(mac) (memcmp(mac, "\x08\x00\x07", 3) && \
+ memcmp(mac, "\x00\xA0\x40", 3) && \
+ memcmp(mac, "\x00\x80\x19", 3) && \
+ memcmp(mac, "\x00\x05\x02", 3))
+
+static void __devinit mac_onboard_sonic_ethernet_addr(struct net_device *dev)
{
struct sonic_local *lp = netdev_priv(dev);
const int prom_addr = ONBOARD_SONIC_PROM_BASE;
- int i;
+ unsigned short val;
- /* On NuBus boards we can sometimes look in the ROM resources.
- No such luck for comm-slot/onboard. */
- for(i = 0; i < 6; i++)
- dev->dev_addr[i] = SONIC_READ_PROM(i);
+ /*
+ * On NuBus boards we can sometimes look in the ROM resources.
+ * No such luck for comm-slot/onboard.
+ * On the PowerBook 520, the PROM base address is a mystery.
+ */
+ if (hwreg_present((void *)prom_addr)) {
+ int i;
- /* Most of the time, the address is bit-reversed. The NetBSD
- source has a rather long and detailed historical account of
- why this is so. */
- if (memcmp(dev->dev_addr, "\x08\x00\x07", 3) &&
- memcmp(dev->dev_addr, "\x00\xA0\x40", 3) &&
- memcmp(dev->dev_addr, "\x00\x80\x19", 3) &&
- memcmp(dev->dev_addr, "\x00\x05\x02", 3))
- bit_reverse_addr(dev->dev_addr);
- else
- return 0;
+ for (i = 0; i < 6; i++)
+ dev->dev_addr[i] = SONIC_READ_PROM(i);
+ if (!INVALID_MAC(dev->dev_addr))
+ return;
- /* If we still have what seems to be a bogus address, we'll
- look in the CAM. The top entry should be ours. */
- /* Danger! This only works if MacOS has already initialized
- the card... */
- if (memcmp(dev->dev_addr, "\x08\x00\x07", 3) &&
- memcmp(dev->dev_addr, "\x00\xA0\x40", 3) &&
- memcmp(dev->dev_addr, "\x00\x80\x19", 3) &&
- memcmp(dev->dev_addr, "\x00\x05\x02", 3))
- {
- unsigned short val;
-
- printk(KERN_INFO "macsonic: PROM seems to be wrong, trying CAM entry 15\n");
-
- SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
- SONIC_WRITE(SONIC_CEP, 15);
-
- val = SONIC_READ(SONIC_CAP2);
- dev->dev_addr[5] = val >> 8;
- dev->dev_addr[4] = val & 0xff;
- val = SONIC_READ(SONIC_CAP1);
- dev->dev_addr[3] = val >> 8;
- dev->dev_addr[2] = val & 0xff;
- val = SONIC_READ(SONIC_CAP0);
- dev->dev_addr[1] = val >> 8;
- dev->dev_addr[0] = val & 0xff;
-
- printk(KERN_INFO "HW Address from CAM 15: %pM\n",
- dev->dev_addr);
- } else return 0;
-
- if (memcmp(dev->dev_addr, "\x08\x00\x07", 3) &&
- memcmp(dev->dev_addr, "\x00\xA0\x40", 3) &&
- memcmp(dev->dev_addr, "\x00\x80\x19", 3) &&
- memcmp(dev->dev_addr, "\x00\x05\x02", 3))
- {
/*
- * Still nonsense ... messed up someplace!
+ * Most of the time, the address is bit-reversed. The NetBSD
+ * source has a rather long and detailed historical account of
+ * why this is so.
*/
- printk(KERN_ERR "macsonic: ERROR (INVALID MAC)\n");
- return -EIO;
- } else return 0;
+ bit_reverse_addr(dev->dev_addr);
+ if (!INVALID_MAC(dev->dev_addr))
+ return;
+
+ /*
+ * If we still have what seems to be a bogus address, we'll
+ * look in the CAM. The top entry should be ours.
+ */
+ printk(KERN_WARNING "macsonic: MAC address in PROM seems "
+ "to be invalid, trying CAM\n");
+ } else {
+ printk(KERN_WARNING "macsonic: cannot read MAC address from "
+ "PROM, trying CAM\n");
+ }
+
+ /* This only works if MacOS has already initialized the card. */
+
+ SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
+ SONIC_WRITE(SONIC_CEP, 15);
+
+ val = SONIC_READ(SONIC_CAP2);
+ dev->dev_addr[5] = val >> 8;
+ dev->dev_addr[4] = val & 0xff;
+ val = SONIC_READ(SONIC_CAP1);
+ dev->dev_addr[3] = val >> 8;
+ dev->dev_addr[2] = val & 0xff;
+ val = SONIC_READ(SONIC_CAP0);
+ dev->dev_addr[1] = val >> 8;
+ dev->dev_addr[0] = val & 0xff;
+
+ if (!INVALID_MAC(dev->dev_addr))
+ return;
+
+ /* Still nonsense ... messed up someplace! */
+
+ printk(KERN_WARNING "macsonic: MAC address in CAM entry 15 "
+ "seems invalid, will use a random MAC\n");
+ random_ether_addr(dev->dev_addr);
}
static int __devinit mac_onboard_sonic_probe(struct net_device *dev)
@@ -402,8 +406,7 @@
SONIC_WRITE(SONIC_ISR, 0x7fff);
/* Now look for the MAC address. */
- if (mac_onboard_sonic_ethernet_addr(dev) != 0)
- return -ENODEV;
+ mac_onboard_sonic_ethernet_addr(dev);
/* Shared init code */
return macsonic_init(dev);