diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 667247f661c56..a664eeb1868d6 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -19,6 +19,7 @@
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
+#include <linux/micrel_phy.h>
 #include <linux/mii.h>
 #include <linux/mm.h>
 #include <linux/module.h>
@@ -600,6 +601,32 @@ static int mdiobus_scan_bus_c45(struct mii_bus *bus)
 	return 0;
 }
 
+/* There are some C22 PHYs which do bad things when where is a C45
+ * transaction on the bus, like accepting a read themselves, and
+ * stomping over the true devices reply, to performing a write to
+ * themselves which was intended for another device. Now that C22
+ * devices have been found, see if any of them are bad for C45, and if we
+ * should skip the C45 scan.
+ */
+static bool mdiobus_prevent_c45_scan(struct mii_bus *bus)
+{
+	int i;
+
+	for (i = 0; i < PHY_MAX_ADDR; i++) {
+		struct phy_device *phydev;
+		u32 oui;
+
+		phydev = mdiobus_get_phy(bus, i);
+		if (!phydev)
+			continue;
+		oui = phydev->phy_id >> 10;
+
+		if (oui == MICREL_OUI)
+			return true;
+	}
+	return false;
+}
+
 /**
  * __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
  * @bus: target mii_bus
@@ -617,8 +644,9 @@ static int mdiobus_scan_bus_c45(struct mii_bus *bus)
 int __mdiobus_register(struct mii_bus *bus, struct module *owner)
 {
 	struct mdio_device *mdiodev;
-	int i, err;
 	struct gpio_desc *gpiod;
+	bool prevent_c45_scan;
+	int i, err;
 
 	if (!bus || !bus->name)
 		return -EINVAL;
@@ -691,8 +719,11 @@ int __mdiobus_register(struct mii_bus *bus, struct module *owner)
 			goto error;
 	}
 
-	if (bus->probe_capabilities == MDIOBUS_C45 ||
-	    bus->probe_capabilities == MDIOBUS_C22_C45) {
+	prevent_c45_scan = mdiobus_prevent_c45_scan(bus);
+
+	if (!prevent_c45_scan &&
+	    (bus->probe_capabilities == MDIOBUS_C45 ||
+	     bus->probe_capabilities == MDIOBUS_C22_C45)) {
 		err = mdiobus_scan_bus_c45(bus);
 		if (err)
 			goto error;
diff --git a/include/linux/micrel_phy.h b/include/linux/micrel_phy.h
index 1f7c33b2f5a3f..771e050883db7 100644
--- a/include/linux/micrel_phy.h
+++ b/include/linux/micrel_phy.h
@@ -8,6 +8,8 @@
 #ifndef _MICREL_PHY_H
 #define _MICREL_PHY_H
 
+#define MICREL_OUI		0x0885
+
 #define MICREL_PHY_ID_MASK	0x00fffff0
 
 #define PHY_ID_KSZ8873MLL	0x000e7237