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

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Message-ID: <20160916105626.GH5020@twins.programming.kicks-ass.net>
Date:   Fri, 16 Sep 2016 12:56:26 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:     Linus Walleij <linus.walleij@...aro.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

On Thu, Sep 15, 2016 at 03:39:22PM +0200, Peter Zijlstra wrote:

> In any case, if this fails, we can always punt and simply count the
> total number of instances of this driver on the system and go with that.

One caveat with that approach is that if this is s module, someone doing
rmmod, insmod a number of times gets tricky.