linux-kernel - Re: [PATCH v2 3/6] device property: Add a function to obtain a node's prefix

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Message-ID: <20190327123659.nna3hqcotnerptiz@pathway.suse.cz>
Date:   Wed, 27 Mar 2019 13:36:59 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org, rafael@...nel.org,
        linux-acpi@...r.kernel.org, devicetree@...r.kernel.org,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v2 3/6] device property: Add a function to obtain a
 node's prefix

On Tue 2019-03-26 15:32:48, Sakari Ailus wrote:
> Hi Andy,
> 
> On Tue, Mar 26, 2019 at 03:16:26PM +0200, Andy Shevchenko wrote:
> > On Tue, Mar 26, 2019 at 02:41:03PM +0200, Sakari Ailus wrote:
> > > The prefix is used for printing purpose before a node, and it also works
> > > as a separator between two nodes.
> > > 
> > 
> > One nit below.
> > 
> > > +static const char *
> > > +acpi_fwnode_get_name_prefix(const struct fwnode_handle *fwnode)
> > > +{
> > > +	struct fwnode_handle *parent;
> > > +
> > 
> > > +	parent = fwnode_get_parent(fwnode);
> > > +	/* Root node. */
> > 
> > I guess a comment could be easier to read if it goes before parent assignment
> > line.
> 
> Only if the comments are changed accordingly. What we're doing here is
> trying to figure out whether this is the root node. I can do that for v3.

IMHO, the comment in acpi_fwnode_get_name() is easier to understand:

/* Is this the root node? */

> > 
> > > +	if (!parent)
> > > +		return "";
> > > +
> > > +	parent = fwnode_get_next_parent(parent);
> > > +	/* Second node from the root; no prefix here either. */
> > 
> > Ditto.

/* Is this 2nd node from the root? */

> > > +	if (!parent)
> > > +		return "";
> > > +
> > > +	fwnode_handle_put(parent);
> > > +
> > > +	/* ACPI device or data node. */
> > > +	return ".";
> > > +}

Best Regards,
Petr