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

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Message-ID: <CAMpxmJXq+vxnjVxhiGWdEBmFBSdvp0JgRFxW6Tbv5ZyHhD+LgA@mail.gmail.com>
Date:   Fri, 16 Sep 2016 16:40:27 +0200
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Peter Rosin <peda@...ntia.se>
Cc:     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>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        linux-gpio <linux-gpio@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: pca953x: fix an incorrect lockdep warning

2016-09-16 16:33 GMT+02:00 Peter Rosin <peda@...ntia.se>:
>
> If this is to be fixed this even for crazy setups where the pattern is
> repeated for more levels, you can look into drivers/i2c/i2c-core.c
> i2c_adapter_depth() and how it's used (i.e. for this exact purpose).
> Maybe it's time to export that function?
>

Hi Peter,

thanks for the heads up. I was not aware of this function. Lockdep
only allows us to specify up to 8 subclasses, but I can't possibly
imagine a setup where more would be needed. I'll submit a series
exporting this function and using it in pca953x.

Best regards,
Bartosz Golaszewski