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

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Message-ID: <9192c38a24804689809fa80601ae9126@TWMBX02.aspeed.com>
Date:   Tue, 5 May 2020 01:51:19 +0000
From:   Ryan Chen <ryan_chen@...eedtech.com>
To:     Wolfram Sang <wsa@...-dreams.de>
CC:     Brendan Higgins <brendanhiggins@...gle.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        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.

> In AST2600 there have a slow peripheral bus between CPU  and i2c 
> controller.
> Therefore GIC i2c interrupt status clear have delay timing, when CPU 
> issue write clear i2c controller interrupt status.
> To avoid this issue, the driver need have read after write  clear at 
> i2c ISR.
> 
> Signed-off-by: ryan_chen <ryan_chen@...eedtech.com>

>Applied to for-current with a Fixes tag, thanks! Please, try to add one next time and please also check how the subsystem formats the $subject line.
[Ryan Chen] Thanks your review, will add fixes tag at subject.