target/linux/brcm47xx/patches-3.10/203-b44-abort-when-no-PHY-is-available-at-all.patch

   1 From 7befa6abe09c84269b8af614a166409090346cf8 Mon Sep 17 00:00:00 2001
   2 From: Hauke Mehrtens <hauke@hauke-m.de>
   3 Date: Fri, 20 Dec 2013 02:16:08 +0100
   4 Subject: [PATCH 203/208] b44: abort when no PHY is available at all
   5
   6 When the phy address is 31, this means that there is no PHY connected
   7 to this MAC at all, no internal and no external PHY. Reading these PHY
   8 registers causes a system reset on some routers.
   9
  10 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  11 Signed-off-by: David S. Miller <davem@davemloft.net>
  12 ---
  13  drivers/net/ethernet/broadcom/b44.c |    6 ++++++
  14  drivers/net/ethernet/broadcom/b44.h |    1 +
  15  2 files changed, 7 insertions(+)
  16
  17 --- a/drivers/net/ethernet/broadcom/b44.c
  18 +++ b/drivers/net/ethernet/broadcom/b44.c
  19 @@ -2207,6 +2207,12 @@ static int b44_init_one(struct ssb_devic
  20                 goto err_out_powerdown;
  21         }
  22
  23 +       if (bp->phy_addr == B44_PHY_ADDR_NO_PHY) {
  24 +               dev_err(sdev->dev, "No PHY present on this MAC, aborting\n");
  25 +               err = -ENODEV;
  26 +               goto err_out_powerdown;
  27 +       }
  28 +
  29         bp->mii_if.dev = dev;
  30         bp->mii_if.mdio_read = b44_mii_read;
  31         bp->mii_if.mdio_write = b44_mii_write;
  32 --- a/drivers/net/ethernet/broadcom/b44.h
  33 +++ b/drivers/net/ethernet/broadcom/b44.h
  34 @@ -282,6 +282,7 @@ struct ring_info {
  35
  36  #define B44_MCAST_TABLE_SIZE           32
  37  #define B44_PHY_ADDR_NO_LOCAL_PHY      30 /* no local phy regs */
  38 +#define B44_PHY_ADDR_NO_PHY            31 /* no phy present at all */
  39  #define B44_MDC_RATIO                  5000000
  40
  41  #define        B44_STAT_REG_DECLARE            \