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

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Date:   Mon, 29 Mar 2021 15:30:47 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Alexandru Ardelean <aardelean@...iqon.com>
Cc:     platform-driver-x86@...r.kernel.org, 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 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?




> ---
>  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;
>  	}
>