linux-kernel - Re: [PATCH 6/9] iio: common: cros_ec_sensors: simplify getting .driver

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Date:   Tue, 12 Oct 2021 09:31:56 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>
CC:     Jonathan Cameron <jic23@...nel.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-renesas-soc@...r.kernel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        <linux-iio@...r.kernel.org>
Subject: Re: [PATCH 6/9] iio: common: cros_ec_sensors: simplify getting
 .driver_data

On Tue, 12 Oct 2021 09:31:11 +0200
Wolfram Sang <wsa+renesas@...g-engineering.com> wrote:

> Hi Jonathan,
> 
> > It's not something that ever bothered me that much, but we have had debates in
> > the past about whether there are semantic issues around this sort of cleanup
> > as it mixes
> > 
> > platform_set_drvdata() with device_get_drvdata()  
> 
> Yeah, I see this concern. Mixing the two makes reading the code a bit
> more difficult. As I said, it wasn't so easy to convert set_drvdata, but
> I will have another go at this.
> 
> > Whilst they access the same pointer today, in theory that isn't necessarily
> > always going to be the case in future and it isn't necessarily apparent
> > to the casual reader of the code.  
> 
> That one I don't really see. *_get_drvdata() should always get
> 'dev->driver_data' and the prefix just tells from what namespace we
> come. If you want to change that, a lot of things will break loose, I'd
> think. Even in the unlikely case of platform_device gaining a seperate
> driver_data(?), it probably should be named *_get_pdrvdata(), or?

Agreed. Does indeed seem like any change to this would be a mess so would
require different naming etc.

Thanks,

Jonathan

> 
> Thanks and happy hacking,
> 
>    Wolfram
> 
>