linux-kernel - Re: [PATCH 01/10] platform/x86: toshiba_acpi: bind life-time of toshiba_acpi

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Date:   Tue, 30 Mar 2021 09:49:34 +0300
From:   Alexandru Ardelean <aardelean@...iqon.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     platform-driver-x86@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-iio@...r.kernel.org, coproscefalo@...il.com,
        hdegoede@...hat.com, mgross@...ux.intel.com, linux@...iqon.com
Subject: Re: [PATCH 01/10] platform/x86: toshiba_acpi: bind life-time of
 toshiba_acpi_dev to parent

On Mon, 29 Mar 2021 at 17:30, Jonathan Cameron <jic23@...nel.org> wrote:
>
> On Wed, 24 Mar 2021 14:55:39 +0200
> Alexandru Ardelean <aardelean@...iqon.com> wrote:
>
> > The 'toshiba_acpi_dev' object is allocated first and free'd last. We can
> > bind it's life-time to the parent ACPI device object. This is a first step
> > in using more device-managed allocated functions for this.
> >
> > The main intent is to try to convert the IIO framework to export only
> > device-managed functions (i.e. devm_iio_device_alloc() and
> > devm_iio_device_register()). It's still not 100% sure that this is
> > possible, but for now, this is the process of taking it slowly in that
> > direction.
> >
> > Signed-off-by: Alexandru Ardelean <aardelean@...iqon.com>
>
> Might just be me, but naming anything dev that isn't a struct device *
> is downright confusing?
>

I found it a bit odd as well, but I decided to not take it in
consideration for now.

>
>
>
> > ---
> >  drivers/platform/x86/toshiba_acpi.c | 6 ++----
> >  1 file changed, 2 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
> > index fa7232ad8c39..6d298810b7bf 100644
> > --- a/drivers/platform/x86/toshiba_acpi.c
> > +++ b/drivers/platform/x86/toshiba_acpi.c
> > @@ -2998,8 +2998,6 @@ static int toshiba_acpi_remove(struct acpi_device *acpi_dev)
> >       if (toshiba_acpi)
> >               toshiba_acpi = NULL;
> >
> > -     kfree(dev);
> > -
> >       return 0;
> >  }
> >
> > @@ -3016,6 +3014,7 @@ static const char *find_hci_method(acpi_handle handle)
> >
> >  static int toshiba_acpi_add(struct acpi_device *acpi_dev)
> >  {
> > +     struct device *parent = &acpi_dev->dev;
> >       struct toshiba_acpi_dev *dev;
> >       const char *hci_method;
> >       u32 dummy;
> > @@ -3033,7 +3032,7 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev)
> >               return -ENODEV;
> >       }
> >
> > -     dev = kzalloc(sizeof(*dev), GFP_KERNEL);
> > +     dev = devm_kzalloc(parent, sizeof(*dev), GFP_KERNEL);
> >       if (!dev)
> >               return -ENOMEM;
> >       dev->acpi_dev = acpi_dev;
> > @@ -3045,7 +3044,6 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev)
> >       ret = misc_register(&dev->miscdev);
> >       if (ret) {
> >               pr_err("Failed to register miscdevice\n");
> > -             kfree(dev);
> >               return ret;
> >       }
> >
>