linux-kernel - Re: [PATCH] spi: gxp: removed unneeded call to platform_set

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Date:   Mon, 7 Aug 2023 20:38:27 +0300
From:   Alexandru Ardelean <alex@...uggie.ro>
To:     Mark Brown <broonie@...nel.org>
Cc:     Andrei Coardos <aboutphysycs@...il.com>,
        linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
        nick.hawkins@....com, verdun@....com
Subject: Re: [PATCH] spi: gxp: removed unneeded call to platform_set_drvdata()

On Mon, Aug 7, 2023 at 4:27 PM Mark Brown <broonie@...nel.org> wrote:
>
> On Mon, Aug 07, 2023 at 04:02:17PM +0300, Andrei Coardos wrote:
>
> > This function call was found to be unnecessary as there is no equivalent
> > platform_get_drvdata() call to access the private data of the driver. Also,
> > the private data is defined in this driver, so there is no risk of it being
> > accessed outside of this driver file.
>
> That isn't enough of a check here - people can still reference the
> driver data without going through the accessor function.

So, is that like calling `platform_get_drvdata()` in a parent/chid
device, to check if the driver-data is set?
Would it make sense for another driver to do that (i.e. check the
driver-data is non-null, but not access the data)?
I can imagine that being possible, but it's a bit quirky.

Or, is the issue with the wording of the comment?