1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/net/phy/fixed.c b/drivers/net/phy/fixed.c
index d60d875cb445..5b19fbbda6d4 100644
--- a/drivers/net/phy/fixed.c
+++ b/drivers/net/phy/fixed.c
@@ -124,6 +124,17 @@ static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
         if (reg_num >= MII_REGS_NUM)
                 return -1;
 
+        /* We do not support emulating Clause 45 over Clause 22 register reads
+         * return an error instead of bogus data.
+         */
+        switch (reg_num) {
+        case MII_MMD_CTRL:
+        case MII_MMD_DATA:
+                return -1;
+        default:
+                break;
+        }
+
         list_for_each_entry(fp, &fmb->phys, node) {
                 if (fp->addr == phy_addr) {
                         /* Issue callback if user registered it. */