linux-kernel - Re: [PATCH] char: hw_random: mpfs-rng: removed unneeded call to platform_set

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Date:   Fri, 1 Sep 2023 09:07:56 +0300
From:   Alexandru Ardelean <alex@...uggie.ro>
To:     Conor Dooley <conor.dooley@...rochip.com>
Cc:     Andrei Coardos <aboutphysycs@...il.com>,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-riscv@...ts.infradead.org, herbert@...dor.apana.org.au,
        olivia@...enic.com, daire.mcnamara@...rochip.com
Subject: Re: [PATCH] char: hw_random: mpfs-rng: removed unneeded call to platform_set_drvdata()

On Mon, Aug 28, 2023 at 2:06 PM Conor Dooley <conor.dooley@...rochip.com> wrote:
>
> On Mon, Aug 28, 2023 at 01:17:57PM +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.
>
> I think Greg previously pointed out to you that is it not sufficient to
> check for platform_get_drvdata() alone, because the information could be
> accessed without going through that helper. That's not the case here,
> but it could be true elsewhere.
>
> Acked-by: Conor Dooley <conor.dooley@...rochip.com>
>
> Thanks,
> Conor.
>
> >
> > Signed-off-by: Andrei Coardos <aboutphysycs@...il.com>
> > ---
> >  drivers/char/hw_random/mpfs-rng.c | 2 --
> >  1 file changed, 2 deletions(-)
> >
> > diff --git a/drivers/char/hw_random/mpfs-rng.c b/drivers/char/hw_random/mpfs-rng.c
> > index c6972734ae62..0994024daa70 100644
> > --- a/drivers/char/hw_random/mpfs-rng.c
> > +++ b/drivers/char/hw_random/mpfs-rng.c
> > @@ -79,8 +79,6 @@ static int mpfs_rng_probe(struct platform_device *pdev)
> >       rng_priv->rng.read = mpfs_rng_read;
> >       rng_priv->rng.name = pdev->name;
> >
> > -     platform_set_drvdata(pdev, rng_priv);
> > -
> >       ret = devm_hwrng_register(&pdev->dev, &rng_priv->rng);

A question would be if there is a desire to keep the prints below, or
would this be sufficient?

          return devm_hwrng_register(&pdev->dev, &rng_priv->rng);

If there is the desire to keep the prints, then:

Reviewed-by: Alexandru Ardelean <alex@...uggie.ro>

> >       if (ret)
> >               return dev_err_probe(&pdev->dev, ret, "Failed to register MPFS hwrng\n");
> > --
> > 2.34.1
> >