[PATCH] wifi: rtw88: increase TX report timeout to fix race condition

[luka . gejak]

From: Luka Gejak <luka.gejak@xxxxxxxxx>

The driver expects the firmware to report TX status within 500ms.
However, a race condition exists when the hardware is under heavy TX
load and is simultaneously interrupted by background scans or
power-saving state transitions. During these events, the firmware may
go off-channel for longer than 500ms, delaying the TX reports.

When this happens, the purge timer fires prematurely, dropping the
tracking skbs from the queue and spamming the kernel log with:
"failed to get tx report from firmware". Dropping these tracking skbs
prevents the driver from reporting TX status back to mac80211, which
breaks rate control accounting and degrades performance.

Increase RTW_TX_PROBE_TIMEOUT to 2500ms. This timeout is large enough
to comfortably accommodate the duration of full WiFi background scans
and sleep transitions without incorrectly tripping the purge timer,
while still eventually catching true firmware lockups.

Fixes: e3037485c68e ("rtw88: new Realtek 802.11ac driver")
Cc: stable@xxxxxxxxxxxxxxx
Tested-by: Luka Gejak <luka.gejak@xxxxxxxxx>
Signed-off-by: Luka Gejak <luka.gejak@xxxxxxxxx>
---
 drivers/net/wireless/realtek/rtw88/tx.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtw88/tx.h b/drivers/net/wireless/realtek/rtw88/tx.h
index d34cdeca16f1..95d15e4f5d34 100644
--- a/drivers/net/wireless/realtek/rtw88/tx.h
+++ b/drivers/net/wireless/realtek/rtw88/tx.h
@@ -7,7 +7,7 @@
 
 #define RTK_TX_MAX_AGG_NUM_MASK		0x1f
 
-#define RTW_TX_PROBE_TIMEOUT		msecs_to_jiffies(500)
+#define RTW_TX_PROBE_TIMEOUT		msecs_to_jiffies(2500)
 
 struct rtw_tx_desc {
 	__le32 w0;
-- 
2.54.0