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| author |   Jonathan Lemon <jonathan.lemon@gmail.com> | 2022-05-13 15:52:31 -0700 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2022-05-16 13:07:46 -0700 |
| commit | da2172a9bfec858ceeb0271b9d444378490398c8 (patch) | |
| tree | 418bb6e59adf98dc47abb9b67452e2167cb5cb43 /drivers/ptp/ptp_ocp.c | |
| parent | net/sched: act_pedit: sanitize shift argument before usage (diff) | |
| download | linux-dev-da2172a9bfec858ceeb0271b9d444378490398c8.tar.xz linux-dev-da2172a9bfec858ceeb0271b9d444378490398c8.zip | |
ptp: ocp: have adjtime handle negative delta_ns correctly
delta_ns is a s64, but it was being passed ptp_ocp_adjtime_coarse
as an u64. Also, it turns out that timespec64_add_ns() only handles
positive values, so perform the math with set_normalized_timespec().
Fixes: 90f8f4c0e3ce ("ptp: ocp: Add ptp_ocp_adjtime_coarse for large adjustments")
Suggested-by: Vadim Fedorenko <vfedorenko@novek.ru>
Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Acked-by: Vadim Fedorenko <vfedorenko@novek.ru>
Link: https://lore.kernel.org/r/20220513225231.1412-1-jonathan.lemon@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/ptp/ptp_ocp.c')
| -rw-r--r-- | drivers/ptp/ptp_ocp.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c index dd45471f6780..36c0e188216b 100644 --- a/drivers/ptp/ptp_ocp.c +++ b/drivers/ptp/ptp_ocp.c @@ -841,7 +841,7 @@ __ptp_ocp_adjtime_locked(struct ptp_ocp *bp, u32 adj_val) } static void -ptp_ocp_adjtime_coarse(struct ptp_ocp *bp, u64 delta_ns) +ptp_ocp_adjtime_coarse(struct ptp_ocp *bp, s64 delta_ns) { struct timespec64 ts; unsigned long flags; @@ -850,7 +850,8 @@ ptp_ocp_adjtime_coarse(struct ptp_ocp *bp, u64 delta_ns) spin_lock_irqsave(&bp->lock, flags); err = __ptp_ocp_gettime_locked(bp, &ts, NULL); if (likely(!err)) { - timespec64_add_ns(&ts, delta_ns); + set_normalized_timespec64(&ts, ts.tv_sec, + ts.tv_nsec + delta_ns); __ptp_ocp_settime_locked(bp, &ts); } spin_unlock_irqrestore(&bp->lock, flags); |