netdev - Re: [patch 11/13] ptp: Split out PTP_MASK_EN

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Message-ID: <aa17c037-d83d-4f02-b212-ca12e43df577@linux.dev>
Date: Sat, 21 Jun 2025 21:32:28 +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 11/13] ptp: Split out PTP_MASK_EN_SINGLE ioctl code

On 20/06/2025 14:24, Thomas Gleixner wrote:
> Finish the ptp_ioctl() cleanup by splitting out the PTP_MASK_EN_SINGLE
> ioctl code and removing the remaining local variables and return
> statements.
> 
> No functional change intended.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
>   drivers/ptp/ptp_chardev.c |   35 +++++++++++++++--------------------
>   1 file changed, 15 insertions(+), 20 deletions(-)
> 
> --- a/drivers/ptp/ptp_chardev.c
> +++ b/drivers/ptp/ptp_chardev.c
> @@ -448,22 +448,28 @@ static long ptp_mask_clear_all(struct ti
>   	return 0;
>   }
>   
> +static long ptp_mask_en_single(struct timestamp_event_queue *tsevq, void __user *arg)
> +{
> +	unsigned int channel;
> +
> +	if (copy_from_user(&channel, arg, sizeof(channel)))
> +		return -EFAULT;
> +	if (channel >= PTP_MAX_CHANNELS)
> +		return -EFAULT;
> +	set_bit(channel, tsevq->mask);
> +	return 0;
> +}
> +
>   long ptp_ioctl(struct posix_clock_context *pccontext, unsigned int cmd,
>   	       unsigned long arg)
>   {
> -	struct ptp_clock *ptp =
> -		container_of(pccontext->clk, struct ptp_clock, clock);
> -	struct timestamp_event_queue *tsevq;
> +	struct ptp_clock *ptp = container_of(pccontext->clk, struct ptp_clock, clock);
>   	void __user *argptr;
> -	unsigned int i;
> -	int err = 0;
>   
>   	if (in_compat_syscall() && cmd != PTP_ENABLE_PPS && cmd != PTP_ENABLE_PPS2)
>   		arg = (unsigned long)compat_ptr(arg);
>   	argptr = (void __force __user *)arg;
>   
> -	tsevq = pccontext->private_clkdata;
> -
>   	switch (cmd) {
>   	case PTP_CLOCK_GETCAPS:
>   	case PTP_CLOCK_GETCAPS2:
> @@ -513,22 +519,11 @@ long ptp_ioctl(struct posix_clock_contex
>   		return ptp_mask_clear_all(pccontext->private_clkdata);
>   
>   	case PTP_MASK_EN_SINGLE:
> -		if (copy_from_user(&i, (void __user *)arg, sizeof(i))) {
> -			err = -EFAULT;
> -			break;
> -		}
> -		if (i >= PTP_MAX_CHANNELS) {
> -			err = -EFAULT;
> -			break;
> -		}
> -		set_bit(i, tsevq->mask);
> -		break;
> +		return ptp_mask_en_single(pccontext->private_clkdata, argptr);
>   
>   	default:
> -		err = -ENOTTY;
> -		break;
> +		return -ENOTTY;
>   	}
> -	return err;
>   }
>   
>   __poll_t ptp_poll(struct posix_clock_context *pccontext, struct file *fp,
> 
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@...ux.dev>