Re: [PATCH net v3] net: phy: mscc: fix deadlock in vsc85xx_default_config

[David Miller]

From: Quentin Schulz <quentin.schulz@xxxxxxxxxxx>
Date: Fri, 23 Nov 2018 19:01:51 +0100

> The vsc85xx_default_config function called in the vsc85xx_config_init
> function which is used by VSC8530, VSC8531, VSC8540 and VSC8541 PHYs
> mistakenly calls phy_read and phy_write in-between phy_select_page and
> phy_restore_page.
> 
> phy_select_page and phy_restore_page actually take and release the MDIO
> bus lock and phy_write and phy_read take and release the lock to write
> or read to a PHY register.
> 
> Let's fix this deadlock by using phy_modify_paged which handles
> correctly a read followed by a write in a non-standard page.
> 
> Fixes: 6a0bfbbe20b0 ("net: phy: mscc: migrate to phy_select/restore_page functions")
> Signed-off-by: Quentin Schulz <quentin.schulz@xxxxxxxxxxx>

Applied.