mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-20 14:13:16 +00:00
50 lines
1.9 KiB
Diff
50 lines
1.9 KiB
Diff
From: Mohammed Shafi Shajakhan <mohammed@qti.qualcomm.com>
|
|
Date: Wed, 30 Nov 2016 10:59:29 +0530
|
|
Subject: [PATCH] ath10k: Fix soft lockup during firmware crash/hw-restart
|
|
|
|
During firmware crash (or) user requested manual restart
|
|
the system gets into a soft lock up state because of the
|
|
below root cause.
|
|
|
|
During user requested hardware restart / firmware crash
|
|
the system goes into a soft lockup state as 'napi_synchronize'
|
|
is called after 'napi_disable' (which sets 'NAPI_STATE_SCHED'
|
|
bit) and it sleeps into infinite loop as it waits for
|
|
'NAPI_STATE_SCHED' to be cleared. This condition is hit because
|
|
'ath10k_hif_stop' is called twice as below (resulting in calling
|
|
'napi_synchronize' after 'napi_disable')
|
|
|
|
'ath10k_core_restart' -> 'ath10k_hif_stop' (ATH10K_STATE_ON) ->
|
|
-> 'ieee80211_restart_hw' -> 'ath10k_start' -> 'ath10k_halt' ->
|
|
'ath10k_core_stop' -> 'ath10k_hif_stop' (ATH10K_STATE_RESTARTING)
|
|
|
|
Fix this by calling 'ath10k_halt' in ath10k_core_restart itself
|
|
as it makes more sense before informing mac80211 to restart h/w
|
|
Also remove 'ath10k_halt' in ath10k_start for the state of 'restarting'
|
|
|
|
Fixes: 3c97f5de1f28 ("ath10k: implement NAPI support")
|
|
Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qti.qualcomm.com>
|
|
---
|
|
|
|
--- a/drivers/net/wireless/ath/ath10k/core.c
|
|
+++ b/drivers/net/wireless/ath/ath10k/core.c
|
|
@@ -1534,7 +1534,7 @@ static void ath10k_core_restart(struct w
|
|
switch (ar->state) {
|
|
case ATH10K_STATE_ON:
|
|
ar->state = ATH10K_STATE_RESTARTING;
|
|
- ath10k_hif_stop(ar);
|
|
+ ath10k_halt(ar);
|
|
ath10k_scan_finish(ar);
|
|
ieee80211_restart_hw(ar->hw);
|
|
break;
|
|
--- a/drivers/net/wireless/ath/ath10k/mac.c
|
|
+++ b/drivers/net/wireless/ath/ath10k/mac.c
|
|
@@ -4470,7 +4470,6 @@ static int ath10k_start(struct ieee80211
|
|
ar->state = ATH10K_STATE_ON;
|
|
break;
|
|
case ATH10K_STATE_RESTARTING:
|
|
- ath10k_halt(ar);
|
|
ar->state = ATH10K_STATE_RESTARTED;
|
|
break;
|
|
case ATH10K_STATE_ON:
|