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ptp: ocp: have adjtime handle negative delta_ns correctly

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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>
This commit is contained in:
Jonathan Lemon 2022-05-13 15:52:31 -07:00 committed by Jakub Kicinski
parent 4d42d54a7d
commit da2172a9bf
1 changed files with 3 additions and 2 deletions
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5
drivers/ptp/ptp_ocp.c
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@ -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);