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-rw-r--r--drivers/net/phy/phy_device.c13
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);