diff mbox series

[BlueZ,v2,2/5] monitor: Fix minimun packet latency

Message ID 20210809224942.225915-2-luiz.dentz@gmail.com
State New
Headers show
Series None | expand

Commit Message

Luiz Augusto von Dentz Aug. 9, 2021, 10:49 p.m. UTC 
From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

It seems timer_sub can produce negative values leading to median packet
latency to be negative e.g conn->last_tx_compl is ahead of
conn->last_tx, in which case it should be discarded.
---
 monitor/analyze.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
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Patch

diff --git a/monitor/analyze.c b/monitor/analyze.c
index 5e0957ad1..d504c8d84 100644
--- a/monitor/analyze.c
+++ b/monitor/analyze.c
@@ -386,8 +386,9 @@  static void evt_num_completed_packets(struct hci_dev *dev, struct timeval *tv,
 		if (timerisset(&conn->last_tx)) {
 			timersub(&conn->last_tx_comp, &conn->last_tx, &res);
 
-			if (!timerisset(&conn->tx_lat_min) ||
-					timercmp(&res, &conn->tx_lat_min, <))
+			if ((!timerisset(&conn->tx_lat_min) ||
+					timercmp(&res, &conn->tx_lat_min, <)) &&
+					res.tv_sec >= 0 && res.tv_usec >= 0)
 				conn->tx_lat_min = res;
 
 			if (!timerisset(&conn->tx_lat_max) ||
@@ -408,6 +409,8 @@  static void evt_num_completed_packets(struct hci_dev *dev, struct timeval *tv,
 						tmp.tv_usec -= 1000000;
 					}
 				}
+
+				conn->tx_lat_med = tmp;
 			} else
 				conn->tx_lat_med = res;