Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (30 commits)
  MAINTAINERS: add netdev to ATM
  ATM: horizon, fix hrz_probe fail path
  pppol2tp: Add missing sock_put() in pppol2tp_release()
  net: Fix soft lockups/OOM issues w/ unix garbage collector
  macvlan: don't broadcast PAUSE frames to macvlan devices
  Phonet: fix oops in phonet_address_del() on non-Phonet device
  netfilter: ctnetlink: fix GFP_KERNEL allocation under spinlock
  sungem: Fix PCS_MIICTRL register write in gem_init_phy().
  net: make skb_truesize_bug() call WARN()
  net: hp-plus uses eip_poll
  net/wireless/reg.c: fix bad WARN_ON in if statement
  ath5k: disable beacon filter when station is not associated
  ath5k: fix Security issue in DebugFS part of ath5k
  ath9k: correct expected max RX buffer size
  ath9k: Fix SW-IOMMU bounce buffer starvation
  mac80211 : Fix setting ad-hoc mode and non-ibss channel
  iwlagn: fix DMA sync
  phylib: Add Vitesse VSC8221 SGMII PHY
  rose: zero length frame filtering in af_rose.c
  bridge: netfilter: fix update_pmtu crash with GRE
  ...

1 files changed, 11 insertions, 2 deletions

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 55bc24b234e3..25acbbde4a60 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -227,8 +227,17 @@ struct phy_device * get_phy_device(struct mii_bus *bus, int addr)
         if (r)
                 return ERR_PTR(r);
 
-        /* If the phy_id is all Fs or all 0s, there is no device there */
-        if ((0xffff == phy_id) || (0x00 == phy_id))
+        /* If the phy_id is mostly Fs, there is no device there */
+        if ((phy_id & 0x1fffffff) == 0x1fffffff)
+                return NULL;
+
+        /*
+         * Broken hardware is sometimes missing the pull down resistor on the
+         * MDIO line, which results in reads to non-existent devices returning
+         * 0 rather than 0xffff. Catch this here and treat 0 as a non-existent
+         * device as well.
+         */
+        if (phy_id == 0)
                 return NULL;
 
         dev = phy_device_create(bus, addr, phy_id);