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net: macb: Fix ptp time adjustment for large negative delta

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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>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Harini Katakam 2018-06-20 17:04:20 +05:30 committed by David S. Miller
parent 30877961b1
commit 64d7839af8
1 changed files with 1 additions and 4 deletions
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5
drivers/net/ethernet/cadence/macb_ptp.c
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@ -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);