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Subject[PATCH net-next] net: phy: fixed_phy: set phy_mask before calling mdiobus_register()
There's no point probing for phys on this artificial bus, so we can
save a little bit of boot time by telling mdiobus_register() not to do

This doesn't have any functional change, since, at this point,
fixed_mdio_read() returns 0xffff for all addresses/registers, so

mdiobus_scan() -> get_phy_device() -> get_phy_c22_id()

will return -ENODEV, which is just ignored.

Signed-off-by: Rasmus Villemoes <>
I was trying to debug something and got distracted by the printk() I
added in get_phy_device() triggering 32 times in a row.

drivers/net/phy/fixed_phy.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/net/phy/fixed_phy.c b/drivers/net/phy/fixed_phy.c
index 03abe6233bbb..aef739c20ac4 100644
--- a/drivers/net/phy/fixed_phy.c
+++ b/drivers/net/phy/fixed_phy.c
@@ -353,6 +353,7 @@ static int __init fixed_mdio_bus_init(void)
fmb->mii_bus->parent = &pdev->dev;
fmb->mii_bus->read = &fixed_mdio_read;
fmb->mii_bus->write = &fixed_mdio_write;
+ fmb->mii_bus->phy_mask = ~0;

ret = mdiobus_register(fmb->mii_bus);
if (ret)
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