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

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Date:   Tue, 5 May 2020 01:52:01 +0000
From:   Ryan Chen <ryan_chen@...eedtech.com>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Wolfram Sang <wsa@...-dreams.de>
CC:     Brendan Higgins <brendanhiggins@...gle.com>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v0 linux master] i2c/busses: Avoid i2c interrupt status
 clear race condition.

> > 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...
[Ryan Chen] Thanks Ben.