Subject: Re: [PATCH 1/2] PTP: introduce new versions of IOCTLs

From: Richard Cochran <[email-masked]>
Date: Sat, 17 Aug 2019 08:59:27 -0700

On Wed, Aug 14, 2019 at 10:47:11AM +0300, Felipe Balbi wrote:
> The current version of the IOCTL have a small problem which prevents us
> from extending the API by making use of reserved fields. In these new
> IOCTLs, we are now making sure that flags and rsv fields are zero which
> will allow us to extend the API in the future.
> 
> Signed-off-by: Felipe Balbi <[email-masked]>
> ---
>  drivers/ptp/ptp_chardev.c      | 58 ++++++++++++++++++++++++++++++++--
>  include/uapi/linux/ptp_clock.h | 12 +++++++
>  2 files changed, 68 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c
> index 18ffe449efdf..204212fc3f8c 100644
> --- a/drivers/ptp/ptp_chardev.c
> +++ b/drivers/ptp/ptp_chardev.c
> @@ -123,9 +123,11 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
>  	struct timespec64 ts;
>  	int enable, err = 0;
>  
> +	memset(&req, 0, sizeof(req));

Nit: please leave a blank line between memset() and switch/case.

>  	switch (cmd) {
>  
>  	case PTP_CLOCK_GETCAPS:
> +	case PTP_CLOCK_GETCAPS2:
>  		memset(&caps, 0, sizeof(caps));
>  		caps.max_adj = ptp->info->max_adj;
>  		caps.n_alarm = ptp->info->n_alarm;

Reviewed-by: Richard Cochran <[email-masked]>