This is a note to let you know that I've just added the patch titled
wil6210: fix deadlock when using fw_no_recovery option
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wil6210-fix-deadlock-when-using-fw_no_recovery-option.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From dfb5b098e0f40b68aa07f2ec55f4dd762efefbfa Mon Sep 17 00:00:00 2001
From: Lior David <qca_liord@xxxxxxxxxxxxxxxx>
Date: Wed, 23 Nov 2016 16:06:41 +0200
Subject: wil6210: fix deadlock when using fw_no_recovery option
From: Lior David <qca_liord@xxxxxxxxxxxxxxxx>
commit dfb5b098e0f40b68aa07f2ec55f4dd762efefbfa upstream.
When FW crashes with no_fw_recovery option, driver
waits for manual recovery with wil->mutex held, this
can easily create deadlocks.
Fix the problem by moving the wait outside the lock.
Signed-off-by: Lior David <qca_liord@xxxxxxxxxxxxxxxx>
Signed-off-by: Maya Erez <qca_merez@xxxxxxxxxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxxxx>
Signed-off-by: Amit Pundir <amit.pundir@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/wireless/ath/wil6210/main.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
--- a/drivers/net/wireless/ath/wil6210/main.c
+++ b/drivers/net/wireless/ath/wil6210/main.c
@@ -330,18 +330,19 @@ static void wil_fw_error_worker(struct w
wil->last_fw_recovery = jiffies;
+ wil_info(wil, "fw error recovery requested (try %d)...\n",
+ wil->recovery_count);
+ if (!no_fw_recovery)
+ wil->recovery_state = fw_recovery_running;
+ if (wil_wait_for_recovery(wil) != 0)
+ return;
+
mutex_lock(&wil->mutex);
switch (wdev->iftype) {
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_P2P_CLIENT:
case NL80211_IFTYPE_MONITOR:
- wil_info(wil, "fw error recovery requested (try %d)...\n",
- wil->recovery_count);
- if (!no_fw_recovery)
- wil->recovery_state = fw_recovery_running;
- if (0 != wil_wait_for_recovery(wil))
- break;
-
+ /* silent recovery, upper layers will see disconnect */
__wil_down(wil);
__wil_up(wil);
break;
Patches currently in stable-queue which might be from qca_liord@xxxxxxxxxxxxxxxx are
queue-4.4/wil6210-fix-deadlock-when-using-fw_no_recovery-option.patch