Re: [RFC PATCH net-next v5 18/25] net: dsa: qca8k: dsa: qca8k: protect MASTER busy_wait with mdio mutex

On Tue, May 11, 2021 at 04:04:53AM +0200, Ansuel Smith wrote:

MDIO_MASTER operation have a dedicated busy wait that is not protected
by the mdio mutex. This can cause situation where the MASTER operation
is done and a normal operation is executed between the MASTER read/write
and the MASTER busy_wait. Rework the qca8k_mdio_read/write function to
address this issue by binding the lock for the whole MASTER operation
and not only the mdio read/write common operation.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew