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

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Message-ID: <20200430141701.GC3355@ninjato>
Date:   Thu, 30 Apr 2020 16:17:01 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     ryan_chen <ryan_chen@...eedtech.com>
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,
        openbmc@...ts.ozlabs.org, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v0 linux master] i2c/busses: Avoid i2c interrupt status
 clear race condition.

On Wed, Apr 29, 2020 at 11:37:37AM +0800, ryan_chen wrote:
> 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.


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