linux-kernel - Re: [PATCH 8/9] regulator: bd71837: BD71837 PMIC regulator driver

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Message-ID: <20180525101423.GH4828@sirena.org.uk>
Date:   Fri, 25 May 2018 11:14:23 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Matti Vaittinen <mazziesaccount@...il.com>
Cc:     "Vaittinen, Matti" <Matti.Vaittinen@...rohmeurope.com>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "sboyd@...nel.org" <sboyd@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "lee.jones@...aro.org" <lee.jones@...aro.org>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Mutanen, Mikko" <Mikko.Mutanen@...rohmeurope.com>,
        "Haikola, Heikki" <Heikki.Haikola@...rohmeurope.com>
Subject: Re: [PATCH 8/9] regulator: bd71837: BD71837 PMIC regulator driver

On Fri, May 25, 2018 at 10:22:53AM +0300, Matti Vaittinen wrote:
> On Thu, May 24, 2018 at 05:51:27PM +0000, Vaittinen, Matti wrote:

> > > devm_regulator_regster()

> > Makes sense. Thanks

> I was going to do 

> -       pmic = kzalloc(sizeof(struct bd71837_pmic), GFP_KERNEL);
> +       pmic = devm_kzalloc(&pdev->dev, sizeof(struct bd71837_pmic),
> +                           GFP_KERNEL);

> and

> -               rdev = regulator_register(desc, &config);
> +               rdev = devm_regulator_register(&pdev->dev, desc, &config);
> 
> but is there now a race regarding freeing the pmic structure and
> unregistering the regulator?

Why?  devm_ stuff gets unwound in the opposite order to the order in
which it was allocated.

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