Re: [PATCH] net: dsa: mv88e6xxx: Fix port_hidden_wait to account for port_base_addr

From: Marek Behún
Date: Sun Apr 24 2022 - 10:52:45 EST

On Sun, 24 Apr 2022 14:17:59 +0000
Nathan Rossi <nathan@xxxxxxxxxxxxxxx> wrote:

> The other port_hidden functions rely on the port_read/port_write
> functions to access the hidden control port. These functions apply the
> offset for port_base_addr where applicable. Update port_hidden_wait to
> use the port_wait_bit so that port_base_addr offsets are accounted for
> when waiting for the busy bit to change.
> Without the offset the port_hidden_wait function would timeout on
> devices that have a non-zero port_base_addr (e.g. MV88E6141), however
> devices that have a zero port_base_addr would operate correctly (e.g.
> MV88E6390).

So basically the code is accessing the wrong register for devices with
non-zero port_base_addr. This means that the patch should have a Fixes
tag with the commit that introduced this bug, so that it gets
backported to relevant stable versions.

Could you resend with Fixes tag?