linux-kernel - Re: [PATCH] driver: pmc_atom: free pmc->regmap in pmc_setup

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Date:   Wed, 1 Dec 2021 10:02:44 +0800
From:   Dongliang Mu <mudongliangabcd@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        platform-driver-x86@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] driver: pmc_atom: free pmc->regmap in pmc_setup_dev

On Tue, Nov 30, 2021 at 10:51 PM Dan Carpenter <dan.carpenter@...cle.com> wrote:
>
> On Tue, Nov 30, 2021 at 10:35:25PM +0800, Dongliang Mu wrote:
> > Smatch reports:
> >
> > drivers/platform/x86/pmc_atom.c:496
> > pmc_setup_dev() warn: 'pmc->regmap' not released on lines: 496.
> >
> > Fix this by deallocating pm->regmap.
> >
> > CC: Dan Carpenter <dan.carpenter@...cle.com>
> > Signed-off-by: Dongliang Mu <mudongliangabcd@...il.com>
> > ---
> >  drivers/platform/x86/pmc_atom.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/platform/x86/pmc_atom.c b/drivers/platform/x86/pmc_atom.c
> > index a9d2a4b98e57..95ba108ed716 100644
> > --- a/drivers/platform/x86/pmc_atom.c
> > +++ b/drivers/platform/x86/pmc_atom.c
> > @@ -492,6 +492,7 @@ static int pmc_setup_dev(struct pci_dev *pdev, const struct pci_device_id *ent)
> >               dev_warn(&pdev->dev, "platform clocks register failed: %d\n",
> >                        ret);
> >
> > +     iounmap(pmc->regmap);
>
> This releases it on the success path so it will break the driver.

Yes. I should only deallocate it in the failure handling of
pm_setup_clks. Will modify it in the v2 version.


>
> regards,
> dan carpenter
>
> >       pmc->init = true;
> >       return ret;
> >  }
> > --
> > 2.25.1