mac80211: quiesce vif before suspending

Cancel all relevant timers/works before suspending (wowlan).

This patch handles the following warning:
WARNING: at net/mac80211/util.c:565 queueing ieee80211 work while going to suspend
Backtrace:
[<bf07b598>] (ieee80211_can_queue_work+0x0/0x4c [mac80211])
[<bf07c28c>] (ieee80211_queue_work+0x0/0x30 [mac80211])
[<bf0690dc>] (ieee80211_sta_timer+0x0/0x3c [mac80211])
[<c00a3008>] (run_timer_softirq+0x0/0x220)
[<c009e530>] (__do_softirq+0x0/0x130)
[<c009e660>] (irq_exit+0x0/0xb4)
[<c004c4a0>] (ipi_timer+0x0/0x4c)
[<c0046350>] (do_local_timer+0x0/0x88)
[<c00488ec>] (cpu_idle+0x0/0xe0)
[<c05294e8>] (rest_init+0x0/0xe0)
[<c0008958>] (start_kernel+0x0/0x314)

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 27 insertions, 16 deletions

diff --git a/net/mac80211/pm.c b/net/mac80211/pm.c
index 730778a2c90c..67839eb90cc1 100644
--- a/net/mac80211/pm.c
+++ b/net/mac80211/pm.c
@@ -6,6 +6,28 @@
 #include "driver-ops.h"
 #include "led.h"
 
+/* return value indicates whether the driver should be further notified */
+static bool ieee80211_quiesce(struct ieee80211_sub_if_data *sdata)
+{
+        switch (sdata->vif.type) {
+        case NL80211_IFTYPE_STATION:
+                ieee80211_sta_quiesce(sdata);
+                return true;
+        case NL80211_IFTYPE_ADHOC:
+                ieee80211_ibss_quiesce(sdata);
+                return true;
+        case NL80211_IFTYPE_MESH_POINT:
+                ieee80211_mesh_quiesce(sdata);
+                return true;
+        case NL80211_IFTYPE_AP_VLAN:
+        case NL80211_IFTYPE_MONITOR:
+                /* don't tell driver about this */
+                return false;
+        default:
+                return true;
+        }
+}
+
 int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
 {
         struct ieee80211_local *local = hw_to_local(hw);
@@ -54,6 +76,10 @@ int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
                         local->quiescing = false;
                         return err;
                 }
+                list_for_each_entry(sdata, &local->interfaces, list) {
+                        cancel_work_sync(&sdata->work);
+                        ieee80211_quiesce(sdata);
+                }
                 goto suspend;
         }
 
@@ -82,23 +108,8 @@ int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
         list_for_each_entry(sdata, &local->interfaces, list) {
                 cancel_work_sync(&sdata->work);
 
-                switch(sdata->vif.type) {
-                case NL80211_IFTYPE_STATION:
-                        ieee80211_sta_quiesce(sdata);
-                        break;
-                case NL80211_IFTYPE_ADHOC:
-                        ieee80211_ibss_quiesce(sdata);
-                        break;
-                case NL80211_IFTYPE_MESH_POINT:
-                        ieee80211_mesh_quiesce(sdata);
-                        break;
-                case NL80211_IFTYPE_AP_VLAN:
-                case NL80211_IFTYPE_MONITOR:
-                        /* don't tell driver about this */
+                if (!ieee80211_quiesce(sdata))
                         continue;
-                default:
-                        break;
-                }
 
                 if (!ieee80211_sdata_running(sdata))
                         continue;