linux-kernel - Re: New underflow of regulator enable count warnings in v5.0-rc1

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Message-ID: <20190129171538.GH10524@sirena.org.uk>
Date:   Tue, 29 Jan 2019 17:15:38 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Doug Anderson <dianders@...omium.org>,
        Sebastian Reichel <sre@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-omap <linux-omap@...r.kernel.org>
Subject: Re: New underflow of regulator enable count warnings in v5.0-rc1

On Tue, Jan 29, 2019 at 09:11:51AM -0800, Tony Lindgren wrote:

> OK. Let's see if Sebastian spots where pwm_vibrator_start()
> and pwm_vibrator_stop() might get called multiple times
> or something similar.

Given that nobody has noticed that the driver stops working entirely
it's possible that the pattern is something like:


    pwm_vibrator_start()
    pwm_vibrator_stop()
    pwm_vibrator_stop()
    pwm_vibrator_start()

so it's a temporary underflow that gets corrected (or it could be that
not many people are using mainline kernels on these systems).  On your
system it's the dummy driver but presumably some other users have it
connected to actual regulators.

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