Re: [PATCH v0 linux master] i2c/busses: Avoid i2c interrupt status clear race condition.

Benjamin Herrenschmidt
2020-04-30T11:01:28Z

On Wed, 2020-04-29 at 11:03 +0200, Wolfram Sang wrote:
> > And is there maybe a Fixes: tag for it?
> > [Ryan Chen] Yes it is a fix patch.
>
> I meant this (from submitting-patches.rst):

It fixes the original implementation of the driver basically. It's just
a classic posted-write fix. The write to clear the pending interrupt is
asynchronous, so you can get spurrious ones if you return from the
handler before it has percolated to the HW.

I assume it's just more visible on the 2600 because of the cores are
significantly faster but the IO bus is still as dumb.

Ryan: You could always add a Fixed-by: tag that specifies the commit
that added the initial driver...

Cheers,
Ben.