From f8c8bd159a9bf626dd4921b7746ff481fce8c758 Mon Sep 17 00:00:00 2001 From: Vadim Fedorenko Date: Wed, 7 Oct 2026 20:33:59 +0000 Subject: [PATCH] ptp: ocp: fix PCIe delay estimation calculation 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. The issue was hit in production (a negative value is observed): # cat /sys/class/timecard/ocp0/ts_window_adjust -3 Fixes: aa05fe67bcd64 ("ptp: ocp: Improve PCIe delay estimation") Signed-off-by: Vadim Fedorenko Reviewed-by: Daniel Machon Link: https://patch.msgid.link/20261007203359.417270-1-vadim.fedorenko@linux.dev Signed-off-by: Jakub Kicinski --- 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;