From 18db594a1005d908d995a2fc8f5a7bf4286fdca0 Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Wed, 6 Nov 2013 10:34:36 +0100
Subject: mac80211: fix scheduled scan rtnl deadlock
When changing cfg80211 to use RTNL locking, this caused a
deadlock in mac80211 as it calls cfg80211_sched_scan_stopped()
from a work item that's on a workqueue that is flushed with
the RTNL held.
Fix this by simply using schedule_work(), the work only needs
to finish running before the wiphy is unregistered, no other
synchronisation (e.g. with suspend) is really required since
for suspend userspace is already blocked anyway when we flush
the workqueue so will only pick up the event after resume.
Cc: stable@vger.kernel.org
Fixes: 5fe231e87372 ("cfg80211: vastly simplify locking")
Reported-and-tested-by: Eliad Peller <eliadx.peller@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
net/mac80211/main.c | 1 +
1 file changed, 1 insertion(+)
(limited to 'net/mac80211/main.c')
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 21d5d44444d..e765f77bb97 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -1047,6 +1047,7 @@ void ieee80211_unregister_hw(struct ieee80211_hw *hw)
cancel_work_sync(&local->restart_work);
cancel_work_sync(&local->reconfig_filter);
+ flush_work(&local->sched_scan_stopped_work);
ieee80211_clear_tx_pending(local);
rate_control_deinitialize(local);
--
cgit v1.2.3-70-g09d2
From 24d47300d118c5909a51b7270276d749cce150a2 Mon Sep 17 00:00:00 2001
From: Karl Beldan <karl.beldan@rivierawaves.com>
Date: Tue, 19 Nov 2013 17:12:05 +0100
Subject: mac80211: set hw initial idle state
ATM, the first call of ieee80211_do_open will configure the hw as
non-idle, even if the interface being brought up is not a monitor, and
this leads to inconsistent sequences like:
register_hw()
do_open(sta)
hw_config(non-idle)
(.. sta is non-idle ..)
scan(sta)
hw_config(idle) (after scan finishes)
do_stop(sta)
do_open(sta)
(.. sta is idle ..)
Signed-off-by: Karl Beldan <karl.beldan@rivierawaves.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
net/mac80211/main.c | 2 ++
1 file changed, 2 insertions(+)
(limited to 'net/mac80211/main.c')
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index e765f77bb97..7d1c3ac48ed 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -940,6 +940,8 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
result);
+ local->hw.conf.flags = IEEE80211_CONF_IDLE;
+
ieee80211_led_init(local);
rtnl_lock();
--
cgit v1.2.3-70-g09d2