[PATCH net] ptp: ocp: fix PCIe delay estimation calculation

[Vadim Fedorenko <vadim.fedorenko@linux.dev>]

The commit in fixes introduced a high cap for delayas U64_MAX value
while ktime_t is actually s64. This is wrong cap as it becomes negative
value and any comparison to a real delay will fail to update delay
value. Use KTIME_MAX constant as correct max cap for PCIe delay.

Fixes: aa05fe67bcd64 ("ptp: ocp: Improve PCIe delay estimation")
Signed-off-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
---
 drivers/ptp/ptp_ocp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c
index 3d26ec1f7b9e..a8cba2f64b98 100644
--- a/drivers/ptp/ptp_ocp.c
+++ b/drivers/ptp/ptp_ocp.c
@@ -1825,7 +1825,7 @@ ptp_ocp_watchdog(struct timer_list *t)
 static void
 ptp_ocp_estimate_pci_timing(struct ptp_ocp *bp)
 {
-	ktime_t start, end, delay = U64_MAX;
+	ktime_t start, end, delay = KTIME_MAX;
 	u32 ctrl;
 	int i;
 
-- 
2.47.3