linux-kernel - Re: [patch 08/13] ptp: Split out PTP_PIN

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Message-ID: <caef5686-961d-43aa-8141-c9c90ada2307@redhat.com>
Date: Tue, 24 Jun 2025 11:22:32 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>
Cc: Richard Cochran <richardcochran@...il.com>, netdev@...r.kernel.org
Subject: Re: [patch 08/13] ptp: Split out PTP_PIN_GETFUNC ioctl code

On 6/20/25 3:24 PM, Thomas Gleixner wrote:
> Continue the ptp_ioctl() cleanup by splitting out the PTP_PIN_GETFUNC ioctl
> code into a helper function. Convert to lock guard while at it.
> 
> No functional change intended.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
>  drivers/ptp/ptp_chardev.c |   52 ++++++++++++++++++++--------------------------
>  1 file changed, 23 insertions(+), 29 deletions(-)
> 
> --- a/drivers/ptp/ptp_chardev.c
> +++ b/drivers/ptp/ptp_chardev.c
> @@ -396,6 +396,28 @@ static long ptp_sys_offset(struct ptp_cl
>  	return copy_to_user(arg, sysoff, sizeof(*sysoff)) ? -EFAULT : 0;
>  }
>  
> +static long ptp_pin_getfunc(struct ptp_clock *ptp, unsigned int cmd, void __user *arg)
> +{
> +	struct ptp_clock_info *ops = ptp->info;
> +	struct ptp_pin_desc pd;
> +
> +	if (copy_from_user(&pd, arg, sizeof(pd)))
> +		return -EFAULT;
> +
> +	if (cmd == PTP_PIN_GETFUNC2 && !mem_is_zero(pd.rsv, sizeof(pd.rsv)))
> +		return -EINVAL;
> +	else
> +		memset(pd.rsv, 0, sizeof(pd.rsv));

Minor nit: I personally find the 'else' statement after return
counter-intuitive and dropping it would save an additional LoC.

Thanks,

Paolo