mac80211: Replace {sw, hw}_scanning variables with a bitfield

Use a bitfield to store the current scan mode instead of two boolean
variables {sw,hw}_scanning. This patch does not introduce functional
changes but allows us to enhance the scan flags later (for example
for background scanning).

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

9 files changed, 31 insertions, 29 deletions

diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index 8e2220000e5c..6e3cca65c460 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -742,7 +742,7 @@ static void ieee80211_ibss_work(struct work_struct *work)
         if (!netif_running(sdata->dev))
                 return;
 
-        if (local->sw_scanning || local->hw_scanning)
+        if (local->scanning)
                 return;
 
         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_ADHOC))
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 4166418b4aa7..783a125402b0 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -570,6 +570,11 @@ enum queue_stop_reason {
         IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 };
 
+enum {
+        SCAN_SW_SCANNING,
+        SCAN_HW_SCANNING
+};
+
 struct ieee80211_local {
         /* embed the driver visible part.
          * don't cast (use the static inlines below), but we keep
@@ -668,7 +673,7 @@ struct ieee80211_local {
 
         /* Scanning and BSS list */
         struct mutex scan_mtx;
-        bool sw_scanning, hw_scanning;
+        unsigned long scanning;
         struct cfg80211_ssid scan_ssid;
         struct cfg80211_scan_request int_scan_req;
         struct cfg80211_scan_request *scan_req;
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 0cb29df09e35..d79a21105042 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -518,7 +518,7 @@ static int ieee80211_stop(struct net_device *dev)
                          * the scan_sdata is NULL already don't send out a
                          * scan event to userspace -- the scan is incomplete.
                          */
-                        if (local->sw_scanning)
+                        if (test_bit(SCAN_SW_SCANNING, &local->scanning))
                                 ieee80211_scan_completed(&local->hw, true);
                 }
 
@@ -920,7 +920,7 @@ u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
         struct ieee80211_sub_if_data *sdata;
         int count = 0;
 
-        if (local->hw_scanning || local->sw_scanning)
+        if (local->scanning)
                 return ieee80211_idle_off(local, "scanning");
 
         list_for_each_entry(sdata, &local->interfaces, list) {
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 02cabbffc19a..c1a799194fff 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -198,7 +198,7 @@ void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
         }
 
         if (changed & BSS_CHANGED_BEACON_ENABLED) {
-                if (local->sw_scanning) {
+                if (test_bit(SCAN_SW_SCANNING, &local->scanning)) {
                         sdata->vif.bss_conf.enable_beacon = false;
                 } else {
                         /*
diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index 8a97b1423088..9a3826978b1c 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -597,7 +597,7 @@ static void ieee80211_mesh_work(struct work_struct *work)
         if (!netif_running(sdata->dev))
                 return;
 
-        if (local->sw_scanning || local->hw_scanning)
+        if (local->scanning)
                 return;
 
         while ((skb = skb_dequeue(&ifmsh->skb_queue)))
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 523c0d994d15..52b6f8327a5b 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -581,7 +581,7 @@ void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
         if (!ifmgd->associated)
                 return;
 
-        if (sdata->local->sw_scanning || sdata->local->hw_scanning)
+        if (sdata->local->scanning)
                 return;
 
         /* Disregard subsequent beacons if we are already running a timer
@@ -639,7 +639,7 @@ static void ieee80211_enable_ps(struct ieee80211_local *local,
          * If we are scanning right now then the parameters will
          * take effect when scan finishes.
          */
-        if (local->hw_scanning || local->sw_scanning)
+        if (local->scanning)
                 return;
 
         if (conf->dynamic_ps_timeout > 0 &&
@@ -2038,7 +2038,7 @@ static void ieee80211_sta_work(struct work_struct *work)
         if (!netif_running(sdata->dev))
                 return;
 
-        if (local->sw_scanning || local->hw_scanning)
+        if (local->scanning)
                 return;
 
         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
@@ -2213,7 +2213,7 @@ static void ieee80211_sta_monitor_work(struct work_struct *work)
                 container_of(work, struct ieee80211_sub_if_data,
                              u.mgd.monitor_work);
 
-        if (sdata->local->sw_scanning || sdata->local->hw_scanning)
+        if (sdata->local->scanning)
                 return;
 
         ieee80211_mgd_probe_ap(sdata, false);
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index d9df819eef3b..9c1679d124ba 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -418,10 +418,10 @@ ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
         struct ieee80211_local *local = rx->local;
         struct sk_buff *skb = rx->skb;
 
-        if (unlikely(local->hw_scanning))
+        if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning)))
                 return ieee80211_scan_rx(rx->sdata, skb);
 
-        if (unlikely(local->sw_scanning)) {
+        if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning))) {
                 /* drop all the other packets during a software scan anyway */
                 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
                         dev_kfree_skb(skb);
@@ -2136,7 +2136,7 @@ static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
                 return;
         }
 
-        if (unlikely(local->sw_scanning || local->hw_scanning))
+        if (unlikely(local->scanning))
                 rx.flags |= IEEE80211_RX_IN_SCAN;
 
         ieee80211_parse_qos(&rx);
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 48f910ae95c0..4233c3d700ce 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -265,7 +265,7 @@ void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
 
         mutex_lock(&local->scan_mtx);
 
-        if (WARN_ON(!local->hw_scanning && !local->sw_scanning)) {
+        if (WARN_ON(!local->scanning)) {
                 mutex_unlock(&local->scan_mtx);
                 return;
         }
@@ -275,16 +275,15 @@ void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
                 return;
         }
 
-        if (local->hw_scanning)
+        if (test_bit(SCAN_HW_SCANNING, &local->scanning))
                 ieee80211_restore_scan_ies(local);
 
         if (local->scan_req != &local->int_scan_req)
                 cfg80211_scan_done(local->scan_req, aborted);
         local->scan_req = NULL;
 
-        was_hw_scan = local->hw_scanning;
-        local->hw_scanning = false;
-        local->sw_scanning = false;
+        was_hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning);
+        local->scanning = 0;
         local->scan_channel = NULL;
 
         /* we only have to protect scan_req and hw/sw scan */
@@ -434,9 +433,9 @@ static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
         }
 
         if (local->ops->hw_scan)
-                local->hw_scanning = true;
+                __set_bit(SCAN_HW_SCANNING, &local->scanning);
         else
-                local->sw_scanning = true;
+                __set_bit(SCAN_SW_SCANNING, &local->scanning);
         /*
          * Kicking off the scan need not be protected,
          * only the scan variable stuff, since now
@@ -459,11 +458,9 @@ static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
         mutex_lock(&local->scan_mtx);
 
         if (rc) {
-                if (local->ops->hw_scan) {
-                        local->hw_scanning = false;
+                if (local->ops->hw_scan)
                         ieee80211_restore_scan_ies(local);
-                } else
-                        local->sw_scanning = false;
+                local->scanning = 0;
 
                 ieee80211_recalc_idle(local);
 
@@ -572,7 +569,7 @@ void ieee80211_scan_work(struct work_struct *work)
                 return;
         }
 
-        if (local->scan_req && !(local->sw_scanning || local->hw_scanning)) {
+        if (local->scan_req && !local->scanning) {
                 struct cfg80211_scan_request *req = local->scan_req;
                 int rc;
 
@@ -663,7 +660,7 @@ void ieee80211_scan_cancel(struct ieee80211_local *local)
          * queued -- mostly at suspend under RTNL.
          */
         mutex_lock(&local->scan_mtx);
-        swscan = local->sw_scanning;
+        swscan = test_bit(SCAN_SW_SCANNING, &local->scanning);
         mutex_unlock(&local->scan_mtx);
 
         if (swscan)
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index ffd3b10f2696..d7491dc2a65c 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -192,7 +192,7 @@ ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
         if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
                 return TX_CONTINUE;
 
-        if (unlikely(tx->local->sw_scanning) &&
+        if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
             !ieee80211_is_probe_req(hdr->frame_control) &&
             !ieee80211_is_nullfunc(hdr->frame_control))
                 /*
@@ -552,7 +552,7 @@ ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
          * Lets not bother rate control if we're associated and cannot
          * talk to the sta. This should not happen.
          */
-        if (WARN((tx->local->sw_scanning) &&
+        if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) &&
                  (sta_flags & WLAN_STA_ASSOC) &&
                  !rate_usable_index_exists(sband, &tx->sta->sta),
                  "%s: Dropped data frame as no usable bitrate found while "
@@ -1411,7 +1411,7 @@ static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
 
         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
             local->hw.conf.dynamic_ps_timeout > 0 &&
-            !local->sw_scanning && !local->hw_scanning && local->ps_sdata) {
+            !(local->scanning) && local->ps_sdata) {
                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
                         ieee80211_stop_queues_by_reason(&local->hw,
                                         IEEE80211_QUEUE_STOP_REASON_PS);