Re: [PATCH v2 1/2 net-next] net: phy: mscc: add support for CLKOUT ctrl reg for VSC8531 and similar

[Andrew Lunn]

> +set_reg:
> +	mutex_lock(&phydev->lock);
> +	rc = phy_modify_paged(phydev, MSCC_PHY_PAGE_EXTENDED_GPIO,
> +			      VSC8531_CLKOUT_CNTL, mask, set);
> +	mutex_unlock(&phydev->lock);

What is this mutex protecting?

     Andrew