Messages in this thread | | | Subject | Re: [PATCH] net: macb: Fix ptp time adjustment for large negative delta | From | Nicolas Ferre <> | Date | Wed, 20 Jun 2018 16:04:17 +0200 |
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On 20/06/2018 at 13:34, Harini Katakam wrote: > When delta passed to gem_ptp_adjtime is negative, the sign is > maintained in the ns_to_timespec64 conversion. Hence timespec_add > should be used directly. timespec_sub will just subtract the negative > value thus increasing the time difference. > > Signed-off-by: Harini Katakam <harini.katakam@xilinx.com>
Makes sense: Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
> --- > drivers/net/ethernet/cadence/macb_ptp.c | 5 +---- > 1 file changed, 1 insertion(+), 4 deletions(-) > > diff --git a/drivers/net/ethernet/cadence/macb_ptp.c b/drivers/net/ethernet/cadence/macb_ptp.c > index 2220c77..6788351 100644 > --- a/drivers/net/ethernet/cadence/macb_ptp.c > +++ b/drivers/net/ethernet/cadence/macb_ptp.c > @@ -170,10 +170,7 @@ static int gem_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta) > > if (delta > TSU_NSEC_MAX_VAL) { > gem_tsu_get_time(&bp->ptp_clock_info, &now); > - if (sign) > - now = timespec64_sub(now, then); > - else > - now = timespec64_add(now, then); > + now = timespec64_add(now, then); > > gem_tsu_set_time(&bp->ptp_clock_info, > (const struct timespec64 *)&now); >
-- Nicolas Ferre
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