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authorFelix Fietkau <nbd@nbd.name>2016-12-13 12:52:16 +0100
committerFelix Fietkau <nbd@nbd.name>2016-12-14 12:13:13 +0100
commit28f6951600d0da31363e9b17dbad3f47097f4104 (patch)
treeca324177754936da4f2ba8919403f9ccbf1dd77f /package/kernel/mac80211/patches/333-ath10k-Fix-soft-lockup-during-firmware-crash-hw-rest.patch
parent7dcccacb98a138e2d7fe8fe70302d30cae4a82ba (diff)
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ath10k: fix a soft-lockup on firmware restart
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Diffstat (limited to 'package/kernel/mac80211/patches/333-ath10k-Fix-soft-lockup-during-firmware-crash-hw-rest.patch')
-rw-r--r--package/kernel/mac80211/patches/333-ath10k-Fix-soft-lockup-during-firmware-crash-hw-rest.patch49
1 files changed, 49 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/333-ath10k-Fix-soft-lockup-during-firmware-crash-hw-rest.patch b/package/kernel/mac80211/patches/333-ath10k-Fix-soft-lockup-during-firmware-crash-hw-rest.patch
new file mode 100644
index 0000000000..89ff1fcfd8
--- /dev/null
+++ b/package/kernel/mac80211/patches/333-ath10k-Fix-soft-lockup-during-firmware-crash-hw-rest.patch
@@ -0,0 +1,49 @@
+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: