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

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Message-ID: <20230828-citable-superjet-d235f036be99@wendy>
Date:   Mon, 28 Aug 2023 12:03:28 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Andrei Coardos <aboutphysycs@...il.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>, <alex@...uggie.ro>,
        <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 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);
>  	if (ret)
>  		return dev_err_probe(&pdev->dev, ret, "Failed to register MPFS hwrng\n");
> -- 
> 2.34.1
> 

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