On Sat, Feb 26, 2022 at 9:45 PM Michael Walle [off-list ref] wrote:

There are boards which use the output of the SGPIO to drive I2C muxers.
SGPIO right now is broken in a way that when the software sets this bit
there is a rather large delay until that value ends up on the hardware
pin.

While digging into this, I've noticed that there is no locking at all
in this driver. Add locking for all RWM accesses.

Please note, that parts of the modification of the first patch are
removed again in a later patch. This is because the first patch is
intended to be backported to the stable trees.

This was also just tested on a LAN9668 SoC. If you have additional
hardware, please test.

Nobody is protesting for three weeks or so, I just applied the patches
for v5.18.

If there are problems we can fix them in the v5.18-rc:s

Yours,
Linus Walleij

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