Re: [PATCH net-next v4 3/3] net: phy: add a PHY write barrier when disabling interrupts

[Andrew Lunn]

> +static int phy_write_barrier(struct phy_device *phydev)
> +{
> +	int err;
> +
> +	err = phy_read(phydev, MII_PHYSID1);
> +	if (err < 0)
> +		return err;

There are a small number of MDIO busses which don't implement C22,
only C45. You are likely to get -EIO or maybe ENODEV, -EOPNOTSUPP,
-EINVAL for such a read. Returning the error than makes
phy_disable_interrupts() fail, etc.

This is why i suggested throwing away the return value.

Maybe call phydev_info() if there is an error, but i suggest making
this a void function.

    Andrew

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