linux-kernel - Re: [PATCH 1/3] pinctrl: cherryview: Serialize register access in suspend and resume hooks

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Message-ID: <CACRpkdYTjFBj4EAvFWtaAu7aaxbKkXy6HffXOzAnBCPKehWRtQ@mail.gmail.com>
Date:   Fri, 4 Nov 2016 16:12:14 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     Christian Steiner <christian.steiner@...look.de>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] pinctrl: cherryview: Serialize register access in
 suspend and resume hooks

On Mon, Oct 31, 2016 at 3:57 PM, Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:

> If async suspend is enabled, the driver may access registers concurrently
> with another instance which may fail because of the bug in Cherryview GPIO
> hardware. Prevent this by taking the shared lock while accessing the
> hardware in suspend and resume hooks.
>
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>

Patch applied.

Yours,
Linus Walleij