b44: abort when no PHY is available at all
When the phy address is 31, this means that there is no PHY connected
to this MAC at all, no internal and no external PHY. Reading these PHY
registers causes a system reset on some routers.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/broadcom/b44.h b/drivers/net/ethernet/broadcom/b44.h
index 57e5357..4b0c5d2 100644
--- a/drivers/net/ethernet/broadcom/b44.h
+++ b/drivers/net/ethernet/broadcom/b44.h
@@ -282,6 +282,7 @@
#define B44_MCAST_TABLE_SIZE 32
#define B44_PHY_ADDR_NO_LOCAL_PHY 30 /* no local phy regs */
+#define B44_PHY_ADDR_NO_PHY 31 /* no phy present at all */
#define B44_MDC_RATIO 5000000
#define B44_STAT_REG_DECLARE \