mac80211: allow scan to complete from any context

The ieee80211_scan_completed() function was a frequent
source of potential deadlocks, since it is called by
drivers but may call back into drivers, so drivers had
to make sure to call it without any locks held, which
frequently lead to more complex code in drivers. Avoid
that problem by allowing the function to be called in
any context, and queueing the actual work it does.
Also update the documentation for it to indicate this.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 32 insertions, 8 deletions

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 9e225f01497b..31713320258c 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -596,11 +596,17 @@ enum queue_stop_reason {
  *      determine if we are on the operating channel or not
  * @SCAN_OFF_CHANNEL: We're off our operating channel for scanning,
  *      gets only set in conjunction with SCAN_SW_SCANNING
+ * @SCAN_COMPLETED: Set for our scan work function when the driver reported
+ *      that the scan completed.
+ * @SCAN_ABORTED: Set for our scan work function when the driver reported
+ *      a scan complete for an aborted scan.
  */
 enum {
         SCAN_SW_SCANNING,
         SCAN_HW_SCANNING,
         SCAN_OFF_CHANNEL,
+        SCAN_COMPLETED,
+        SCAN_ABORTED,
 };
 
 /**
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 31f233f7f51a..d60389ba9b95 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -248,13 +248,11 @@ static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
         return true;
 }
 
-void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
+static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
 {
         struct ieee80211_local *local = hw_to_local(hw);
         bool was_hw_scan;
 
-        trace_api_scan_completed(local, aborted);
-
         mutex_lock(&local->mtx);
 
         /*
@@ -312,6 +310,18 @@ void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
         ieee80211_mesh_notify_scan_completed(local);
         ieee80211_queue_work(&local->hw, &local->work_work);
 }
+
+void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
+{
+        struct ieee80211_local *local = hw_to_local(hw);
+
+        trace_api_scan_completed(local, aborted);
+
+        set_bit(SCAN_COMPLETED, &local->scanning);
+        if (aborted)
+                set_bit(SCAN_ABORTED, &local->scanning);
+        ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
+}
 EXPORT_SYMBOL(ieee80211_scan_completed);
 
 static int ieee80211_start_sw_scan(struct ieee80211_local *local)
@@ -449,7 +459,7 @@ static int ieee80211_scan_state_decision(struct ieee80211_local *local,
 
         /* if no more bands/channels left, complete scan and advance to the idle state */
         if (local->scan_channel_idx >= local->scan_req->n_channels) {
-                ieee80211_scan_completed(&local->hw, false);
+                __ieee80211_scan_completed(&local->hw, false);
                 return 1;
         }
 
@@ -641,6 +651,14 @@ void ieee80211_scan_work(struct work_struct *work)
         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
         unsigned long next_delay = 0;
 
+        if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
+                bool aborted;
+
+                aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
+                __ieee80211_scan_completed(&local->hw, aborted);
+                return;
+        }
+
         mutex_lock(&local->mtx);
         if (!sdata || !local->scan_req) {
                 mutex_unlock(&local->mtx);
@@ -651,7 +669,7 @@ void ieee80211_scan_work(struct work_struct *work)
                 int rc = drv_hw_scan(local, sdata, local->hw_scan_req);
                 mutex_unlock(&local->mtx);
                 if (rc)
-                        ieee80211_scan_completed(&local->hw, true);
+                        __ieee80211_scan_completed(&local->hw, true);
                 return;
         }
 
@@ -666,7 +684,7 @@ void ieee80211_scan_work(struct work_struct *work)
                 mutex_unlock(&local->mtx);
 
                 if (rc)
-                        ieee80211_scan_completed(&local->hw, true);
+                        __ieee80211_scan_completed(&local->hw, true);
                 return;
         }
 
@@ -676,7 +694,7 @@ void ieee80211_scan_work(struct work_struct *work)
          * Avoid re-scheduling when the sdata is going away.
          */
         if (!ieee80211_sdata_running(sdata)) {
-                ieee80211_scan_completed(&local->hw, true);
+                __ieee80211_scan_completed(&local->hw, true);
                 return;
         }
 
@@ -783,5 +801,5 @@ void ieee80211_scan_cancel(struct ieee80211_local *local)
         mutex_unlock(&local->mtx);
 
         if (abortscan)
-                ieee80211_scan_completed(&local->hw, true);
+                __ieee80211_scan_completed(&local->hw, true);
 }