linux-kernel - Re: lockdep: incorrect deadlock warning with two GPIO expanders

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Message-ID: <CAMpxmJUMv_9MCuProjbUQZ4O1sy+m1oPHjyzUireHzJRtR+1KQ@mail.gmail.com>
Date:   Fri, 16 Sep 2016 16:21:10 +0200
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Ingo Molnar <mingo@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-gpio <linux-gpio@...r.kernel.org>
Subject: Re: lockdep: incorrect deadlock warning with two GPIO expanders

2016-09-15 14:41 GMT+02:00 Linus Walleij <linus.walleij@...aro.org>:
>
> Oh clever. Of course.
>
> Bartosz can you try out this approach?
>
> Yours,
> Linus Walleij

Hi Linus,

I submitted a patch reusing a routine already present in i2c.h that
allows to test if an i2c adapter's parent is also an i2c adapter,
which is the case for adapters behind a multiplexer.

Also Cc'ed linux-i2c and Wolfram Sang to let him take a look if the
API is used correctly.

Best regards,
Bartosz Golaszewski