From 7befa6abe09c84269b8af614a166409090346cf8 Mon Sep 17 00:00:00 2001 From: Hauke Mehrtens Date: Fri, 20 Dec 2013 02:16:08 +0100 Subject: [PATCH 203/208] 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 Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/b44.c | 6 ++++++ drivers/net/ethernet/broadcom/b44.h | 1 + 2 files changed, 7 insertions(+) --- a/drivers/net/ethernet/broadcom/b44.c +++ b/drivers/net/ethernet/broadcom/b44.c @@ -2207,6 +2207,12 @@ static int b44_init_one(struct ssb_devic goto err_out_powerdown; } + if (bp->phy_addr == B44_PHY_ADDR_NO_PHY) { + dev_err(sdev->dev, "No PHY present on this MAC, aborting\n"); + err = -ENODEV; + goto err_out_powerdown; + } + bp->mii_if.dev = dev; bp->mii_if.mdio_read = b44_mii_read; bp->mii_if.mdio_write = b44_mii_write; --- a/drivers/net/ethernet/broadcom/b44.h +++ b/drivers/net/ethernet/broadcom/b44.h @@ -282,6 +282,7 @@ struct ring_info { #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 \