linux-kernel - Re: [PATCH 5/5] platform/x86: Add Intel Software Defined Silicon driver

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Message-ID: <YVa1aiTqS6Ik5cO1@kroah.com>
Date:   Fri, 1 Oct 2021 09:14:50 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     "David E. Box" <david.e.box@...ux.intel.com>
Cc:     lee.jones@...aro.org, hdegoede@...hat.com, mgross@...ux.intel.com,
        bhelgaas@...gle.com, andriy.shevchenko@...ux.intel.com,
        srinivas.pandruvada@...el.com, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH 5/5] platform/x86: Add Intel Software Defined Silicon
 driver

On Thu, Sep 30, 2021 at 06:28:15PM -0700, David E. Box wrote:
> +static int sdsi_device_open(struct inode *inode, struct file *file)
> +{
> +	struct miscdevice *miscdev = file->private_data;
> +
> +	get_device(miscdev->this_device);

Why do you think this is needed?  Shouldn't the misc core handle all of
this for you already?

> +
> +	return 0;
> +}
> +
> +static int sdsi_device_release(struct inode *inode, struct file *file)
> +{
> +
> +	struct miscdevice *miscdev = file->private_data;
> +	struct sdsi_priv *priv = to_sdsi_priv(miscdev);
> +
> +	if (priv->akc_owner == file)
> +		priv->akc_owner = NULL;

Why is this needed?

> +
> +	put_device(miscdev->this_device);

I see this matches the open call, but if you do not have this in the
open call, is it needed here as well?

> +	ret = devm_add_action_or_reset(priv->miscdev.this_device, sdsi_miscdev_remove, priv);
> +	if (ret)
> +		goto deregister_misc;

I think this is all you need to clean up your device memory, not the
get/put device in open/release, right?

thanks,

greg k-h