From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net 2/2] ptp: uapi: change _IOW to IOWR in
 PTP_SYS_OFFSET_EXTENDED definition
Date: Mon, 07 Jan 2019 08:29:58 -0800 (PST)
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        <20190107152238.GA18065@asgard.redhat.com>
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From: Eugene Syromiatnikov <esyr@redhat.com>
Date: Mon, 7 Jan 2019 16:22:38 +0100

> --- a/include/uapi/linux/ptp_clock.h
> +++ b/include/uapi/linux/ptp_clock.h
> @@ -147,7 +147,7 @@ struct ptp_pin_desc {
>  #define PTP_SYS_OFFSET_PRECISE \
>  	_IOWR(PTP_CLK_MAGIC, 8, struct ptp_sys_offset_precise)
>  #define PTP_SYS_OFFSET_EXTENDED \
> -	_IOW(PTP_CLK_MAGIC, 9, struct ptp_sys_offset_extended)
> +	_IOWR(PTP_CLK_MAGIC, 9, struct ptp_sys_offset_extended)

Again, this changes the ioctl cmd value and will break userspace.