linux-kernel - Re: [PATCH] gpio: pca953x: fix an incorrect lockdep warning

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Message-ID: <CAMpxmJUWJr7eEWDekSX=wwQ=vfuExfMDY1yFpnT8PW0vwMq0RQ@mail.gmail.com>
Date:   Fri, 16 Sep 2016 18:04:36 +0200
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Vignesh R <vigneshr@...com>, Yong Li <yong.b.li@...el.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Wolfram Sang <wsa@...-dreams.de>, Peter Rosin <peda@...ntia.se>
Cc:     linux-i2c <linux-i2c@...r.kernel.org>,
        linux-gpio <linux-gpio@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH] gpio: pca953x: fix an incorrect lockdep warning

2016-09-16 16:18 GMT+02:00 Bartosz Golaszewski <bgolaszewski@...libre.com>:
> If an I2C GPIO multiplexer is driven by a GPIO provided by an expander
> when there's a second expander using the same device driver on one of
> the I2C bus segments, lockdep prints a deadlock warning when trying to
> set the direction or the value of the GPIOs provided by the second
> expander.

[snip]

Superseded by v2.

Thanks,
Bartosz