linux-kernel - Re: [patch 07/13] ptp: Split out PTP_SYS

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Message-ID: <83c30e4a-d674-47a7-bda9-4b2fc0d590e3@linux.dev>
Date: Sat, 21 Jun 2025 21:14:07 +0100
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
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 07/13] ptp: Split out PTP_SYS_OFFSET ioctl code

On 20/06/2025 14:24, Thomas Gleixner wrote:
> Continue the ptp_ioctl() cleanup by splitting out the PTP_SYS_OFFSET ioctl
> code into a helper function.
> 
> Convert it to __free() to avoid gotos.
> 
> No functional change intended.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
>   drivers/ptp/ptp_chardev.c |   78 +++++++++++++++++++++++-----------------------
>   1 file changed, 40 insertions(+), 38 deletions(-)
> 
> --- a/drivers/ptp/ptp_chardev.c
> +++ b/drivers/ptp/ptp_chardev.c
> @@ -357,18 +357,54 @@ static long ptp_sys_offset_extended(stru
>   	return copy_to_user(arg, extoff, sizeof(*extoff)) ? -EFAULT : 0;
>   }
>   
> +static long ptp_sys_offset(struct ptp_clock *ptp, void __user *arg)
> +{
> +	struct ptp_sys_offset *sysoff __free(kfree) = NULL;
> +	struct ptp_clock_time *pct;
> +	struct timespec64 ts;
> +
> +	sysoff = memdup_user(arg, sizeof(*sysoff));
> +	if (IS_ERR(sysoff))
> +		return PTR_ERR(sysoff);
> +
> +	if (sysoff->n_samples > PTP_MAX_SAMPLES)
> +		return -EINVAL;
> +
> +	pct = &sysoff->ts[0];
> +	for (unsigned int i = 0; i < sysoff->n_samples; i++) {
> +		struct ptp_clock_info *ops = ptp->info;

Looks like *ops initialization can be moved outside of the loop.

> +		int err;
> +
> +		ktime_get_real_ts64(&ts);
> +		pct->sec = ts.tv_sec;
> +		pct->nsec = ts.tv_nsec;
> +		pct++;
> +		if (ops->gettimex64)
> +			err = ops->gettimex64(ops, &ts, NULL);
> +		else
> +			err = ops->gettime64(ops, &ts);
> +		if (err)
> +			return err;
> +		pct->sec = ts.tv_sec;
> +		pct->nsec = ts.tv_nsec;
> +		pct++;
> +	}
> +	ktime_get_real_ts64(&ts);
> +	pct->sec = ts.tv_sec;
> +	pct->nsec = ts.tv_nsec;
> +
> +	return copy_to_user(arg, sysoff, sizeof(*sysoff)) ? -EFAULT : 0;
> +}
> +

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