linux-kernel - Re: [PATCH v3 3/9] device property: add index argument to property_read_string

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Date:   Mon, 28 Mar 2022 16:28:12 +0200
From:   Clément Léger <clement.leger@...tlin.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Wolfram Sang <wsa@...nel.org>, Peter Rosin <peda@...ntia.se>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Len Brown <lenb@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Allan Nielsen <allan.nielsen@...rochip.com>,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 3/9] device property: add index argument to
 property_read_string_array() callback

Le Fri, 25 Mar 2022 16:30:45 +0200,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com> a écrit :

> >  	pointer = property_entry_find(props, propname, length);
> >  	if (IS_ERR(pointer))
> >  		return PTR_ERR(pointer);  
> 
> > +	if (index >= array_len)
> > +		return -ENODATA;  
> 
> I was about to ask if we can check this before the
> property_entry_find() call, but realized that in such case it will
> shadow possible errors due to wrong or absent property.

I think you are actually right, the check can be done after
property_entry_count_elems_of_size() since it already checks for the
property to be present. I'll move that check.

> 
> ...
> 
> > -		of_property_read_string_array(node, propname, val,
> > nval) :
> > +		of_property_read_string_array_index(node,
> > propname, val, nval,
> > +						    index) :  
> 
> Dunno about the style there, but I think it can be one line.

Seems like the complete file is strictly applying the 80 columns rules
so I thought it was better to keep it like this. However, I think the
ternary oeprator is not really readable with such split.

-- 
Clément Léger,
Embedded Linux and Kernel engineer at Bootlin
https://bootlin.com