linux-kernel - Re: [PATCH v2 2/2] PTP: add support for one-shot output

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Date:   Thu, 29 Aug 2019 10:25:09 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Felipe Balbi <felipe.balbi@...ux.intel.com>
Cc:     Christopher S Hall <christopher.s.hall@...el.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] PTP: add support for one-shot output

On Thu, Aug 29, 2019 at 12:58:25PM +0300, Felipe Balbi wrote:
> diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c
> index 98ec1395544e..a407e5f76e2d 100644
> --- a/drivers/ptp/ptp_chardev.c
> +++ b/drivers/ptp/ptp_chardev.c
> @@ -177,9 +177,8 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
>  			err = -EFAULT;
>  			break;
>  		}
> -		if ((req.perout.flags || req.perout.rsv[0] || req.perout.rsv[1]
> -				|| req.perout.rsv[2] || req.perout.rsv[3])
> -			&& cmd == PTP_PEROUT_REQUEST2) {
> +		if ((req.perout.rsv[0] || req.perout.rsv[1] || req.perout.rsv[2]
> +			|| req.perout.rsv[3]) && cmd == PTP_PEROUT_REQUEST2) {

Please check that the reserved bits of req.perout.flags, namely
~PTP_PEROUT_ONE_SHOT, are clear.

>  			err = -EINVAL;
>  			break;
>  		} else if (cmd == PTP_PEROUT_REQUEST) {
> diff --git a/include/uapi/linux/ptp_clock.h b/include/uapi/linux/ptp_clock.h
> index 039cd62ec706..95840e5f5c53 100644
> --- a/include/uapi/linux/ptp_clock.h
> +++ b/include/uapi/linux/ptp_clock.h
> @@ -67,7 +67,9 @@ struct ptp_perout_request {
>  	struct ptp_clock_time start;  /* Absolute start time. */
>  	struct ptp_clock_time period; /* Desired period, zero means disable. */
>  	unsigned int index;           /* Which channel to configure. */
> -	unsigned int flags;           /* Reserved for future use. */
> +
> +#define PTP_PEROUT_ONE_SHOT BIT(0)
> +	unsigned int flags;

@davem  Any CodingStyle policy on #define within a struct?  (Some
maintainers won't allow it.)

>  	unsigned int rsv[4];          /* Reserved for future use. */
>  };
>  
> -- 
> 2.23.0
> 

Thanks,
Richard