linux-kernel - Re: [PATCH v2 1/3] software node: Introduce device_add_software

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Date:   Wed, 13 Jan 2021 13:39:18 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Daniel Scally <djrscally@...il.com>
Cc:     Felipe Balbi <balbi@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 1/3] software node: Introduce
 device_add_software_node()

Hi Daniel,

On Wed, Jan 13, 2021 at 12:40:03AM +0000, Daniel Scally wrote:
> Hi Heikki
> 
> On 11/01/2021 14:10, Heikki Krogerus wrote:
> > This helper will register a software node and then assign
> > it to device at the same time. The function will also make
> > sure that the device can't have more than one software node.
> > 
> > Tested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> > ---
> 
> I like this change. One comment below, but for what it's worth:
> 
> Reviewed-by: Daniel Scally <djrscally@...il.com>

Thanks!

> > +/**
> > + * device_remove_software_node - Remove device's software node
> > + * @dev: The device with the software node.
> > + *
> > + * This function will unregister the software node of @dev.
> > + */
> > +void device_remove_software_node(struct device *dev)
> > +{
> > +	struct swnode *swnode;
> > +
> > +	swnode = dev_to_swnode(dev);
> > +	if (!swnode)
> > +		return;
> > +
> > +	kobject_put(&swnode->kobj);
> > +}
> > +EXPORT_SYMBOL_GPL(device_remove_software_node);
> 
> I wonder if this also ought to set dev_fwnode(dev)->secondary back to
> ERR_PTR(-ENODEV)?

We can't do that here unfortunately. Other places still have a
reference to the swnode at this point and they may still need to
access it using the dev_fwnode(dev)->secondary pointer.

-- 
heikki