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SubjectRe: [PATCH v2 2/2] PTP: add support for one-shot output
Date

Hi,

Richard Cochran <richardcochran@gmail.com> writes:
> Adding davem onto CC...
>
> 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.

Actually, we should check more. PEROUT_FEATURE_ENABLE is still valid
here, right? So are RISING and FALLING edges, no?

>
>> 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.)

seems like this should be defined together with the other flags? If
that's the case, it seems like we would EXTTS and PEROUT masks.

--
balbi
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