From 64d7839af8c8f67daaf9bf387135052c55d85f90 Mon Sep 17 00:00:00 2001 From: Harini Katakam Date: Wed, 20 Jun 2018 17:04:20 +0530 Subject: [PATCH] net: macb: Fix ptp time adjustment for large negative delta 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 Acked-by: Nicolas Ferre Signed-off-by: David S. Miller --- 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 2220c771092b..678835136bf8 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);