Re: [PATCH net-next v1 1/1] net: dsa: ar9331: fix potential dead lock on mdio access

[Andrew Lunn]

>  static int ar9331_mdio_read(void *ctx, const void *reg_buf, size_t reg_len,
> @@ -849,6 +849,8 @@ static int ar9331_mdio_read(void *ctx, const void *reg_buf, size_t reg_len,
>  		return 0;
>  	}
>  
> +	mutex_lock_nested(&sbus->mdio_lock, MDIO_MUTEX_NESTED);
> +

Do you know about mdiobus_read_nested() and
mdiobus_write_nested(). The mv88e6xxx driver uses these.

	Andrew