[PATCH] char: hw_random: mpfs-rng: removed unneeded call to platform_set_drvdata()

[PATCH] char: hw_random: mpfs-rng: removed unneeded call to platform_set_drvdata()

[Andrei Coardos]

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.

Signed-off-by: Andrei Coardos <aboutphysycs@gmail.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);
 	if (ret)
 		return dev_err_probe(&pdev->dev, ret, "Failed to register MPFS hwrng\n");
-- 
2.34.1

Re: [PATCH] char: hw_random: mpfs-rng: removed unneeded call to platform_set_drvdata()

[Conor Dooley]

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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@microchip.com>

Thanks,
Conor.

> 
> Signed-off-by: Andrei Coardos <aboutphysycs@gmail.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);
>  	if (ret)
>  		return dev_err_probe(&pdev->dev, ret, "Failed to register MPFS hwrng\n");
> -- 
> 2.34.1
> 

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Re: [PATCH] char: hw_random: mpfs-rng: removed unneeded call to platform_set_drvdata()

[Alexandru Ardelean]

On Mon, Aug 28, 2023 at 2:06 PM Conor Dooley <conor.dooley@microchip.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@microchip.com>
>
> Thanks,
> Conor.
>
> >
> > Signed-off-by: Andrei Coardos <aboutphysycs@gmail.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@shruggie.ro>

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

Re: [PATCH] char: hw_random: mpfs-rng: removed unneeded call to platform_set_drvdata()

[Conor Dooley]

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On Fri, Sep 01, 2023 at 09:07:56AM +0300, Alexandru Ardelean wrote:
> On Mon, Aug 28, 2023 at 2:06 PM Conor Dooley <conor.dooley@microchip.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@microchip.com>
> >
> > Thanks,
> > Conor.
> >
> > >
> > > Signed-off-by: Andrei Coardos <aboutphysycs@gmail.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:

Yeah, I'd like to keep a print in the failing case, thanks.

> 
> Reviewed-by: Alexandru Ardelean <alex@shruggie.ro>
> 
> > >       if (ret)
> > >               return dev_err_probe(&pdev->dev, ret, "Failed to register MPFS hwrng\n");
> > > --
> > > 2.34.1
> > >

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Re: [PATCH] char: hw_random: mpfs-rng: removed unneeded call to platform_set_drvdata()

[Herbert Xu]

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.
> 
> Signed-off-by: Andrei Coardos <aboutphysycs@gmail.com>
> ---
>  drivers/char/hw_random/mpfs-rng.c | 2 --
>  1 file changed, 2 deletions(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt