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

   1 From d6668993d793d39e2c9d7699e8079462cae67f7e Mon Sep 17 00:00:00 2001
   2 From: Hauke Mehrtens <hauke@hauke-m.de>
   3 Date: Thu, 3 Oct 2013 20:49:10 +0200
   4 Subject: [PATCH 4/9] 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 ---
  12  drivers/net/ethernet/broadcom/b44.c |    6 ++++++
  13  drivers/net/ethernet/broadcom/b44.h |    1 +
  14  2 files changed, 7 insertions(+)
  15
  16 --- a/drivers/net/ethernet/broadcom/b44.c
  17 +++ b/drivers/net/ethernet/broadcom/b44.c
  18 @@ -2207,6 +2207,12 @@ static int b44_init_one(struct ssb_devic
  19                 goto err_out_powerdown;
  20         }
  21
  22 +       if (bp->phy_addr == B44_PHY_ADDR_NO_PHY) {
  23 +               dev_err(sdev->dev, "No PHY present on this MAC, aborting\n");
  24 +               err = -ENODEV;
  25 +               goto err_out_powerdown;
  26 +       }
  27 +
  28         bp->mii_if.dev = dev;
  29         bp->mii_if.mdio_read = b44_mii_read;
  30         bp->mii_if.mdio_write = b44_mii_write;
  31 --- a/drivers/net/ethernet/broadcom/b44.h
  32 +++ b/drivers/net/ethernet/broadcom/b44.h
  33 @@ -282,6 +282,7 @@ struct ring_info {
  34
  35  #define B44_MCAST_TABLE_SIZE           32
  36  #define B44_PHY_ADDR_NO_LOACL_PHY      30 /* no local phy regs */
  37 +#define B44_PHY_ADDR_NO_PHY            31 /* no phy present at all */
  38  #define B44_MDC_RATIO                  5000000
  39
  40  #define        B44_STAT_REG_DECLARE            \