netdev - Re: [PATCH v2 1/2] PTP: introduce new versions of IOCTLs

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Date:   Fri, 30 Aug 2019 10:57:55 +0300
From:   Felipe Balbi <felipe.balbi@...ux.intel.com>
To:     Richard Cochran <richardcochran@...il.com>
Cc:     Christopher S Hall <christopher.s.hall@...el.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] PTP: introduce new versions of IOCTLs


Hi,

Richard Cochran <richardcochran@...il.com> writes:
>> @@ -139,11 +141,24 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
>>  		break;
>>  
>>  	case PTP_EXTTS_REQUEST:
>> +	case PTP_EXTTS_REQUEST2:
>> +		memset(&req, 0, sizeof(req));
>> +
>>  		if (copy_from_user(&req.extts, (void __user *)arg,
>>  				   sizeof(req.extts))) {
>>  			err = -EFAULT;
>>  			break;
>>  		}
>> +		if ((req.extts.flags || req.extts.rsv[0] || req.extts.rsv[1])
>> +			&& cmd == PTP_EXTTS_REQUEST2) {
>> +			err = -EINVAL;
>> +			break;
>> +		} else if (cmd == PTP_EXTTS_REQUEST) {
>> +			req.extts.flags = 0;
>
> This still isn't quite right.  Sorry that was my fault.
>
> The req.extts.flags can be (PTP_ENABLE_FEATURE | PTP_RISING_EDGE |
> PTP_FALLING_EDGE), and ENABLE is used immediately below in this case.
>
> Please #define those bits into a valid mask, and then:
>
> - for PTP_EXTTS_REQUEST2 check that ~mask is zero, and
> - for PTP_EXTTS_REQUEST clear the ~mask bits for the drivers. 
>
> Thanks again for cleaning this up!

good point. This will actually reduce the size of the patch 2.

-- 
balbi

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