mwifiex: use LOW_PRIORITY scan flag provided in scan request

We will delay/abort scan operation based on traffic for low
priority scan.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 9 insertions, 3 deletions

diff --git a/drivers/net/wireless/mwifiex/cfg80211.c b/drivers/net/wireless/mwifiex/cfg80211.c
index 38a58713de6..60461325dff 100644
--- a/drivers/net/wireless/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/mwifiex/cfg80211.c
@@ -1819,7 +1819,8 @@ mwifiex_cfg80211_scan(struct wiphy *wiphy,
 
         wiphy_dbg(wiphy, "info: received scan request on %s\n", dev->name);
 
-        if (atomic_read(&priv->wmm.tx_pkts_queued) >=
+        if ((request->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) &&
+            atomic_read(&priv->wmm.tx_pkts_queued) >=
             MWIFIEX_MIN_TX_PENDING_TO_CANCEL_SCAN) {
                 dev_dbg(priv->adapter->dev, "scan rejected due to traffic\n");
                 return -EBUSY;
@@ -2251,7 +2252,8 @@ int mwifiex_register_cfg80211(struct mwifiex_adapter *adapter)
         wiphy->available_antennas_rx = BIT(adapter->number_of_antenna) - 1;
 
         wiphy->features |= NL80211_FEATURE_HT_IBSS |
-                           NL80211_FEATURE_INACTIVITY_TIMER;
+                           NL80211_FEATURE_INACTIVITY_TIMER |
+                           NL80211_FEATURE_LOW_PRIORITY_SCAN;
 
         /* Reserve space for mwifiex specific private data for BSS */
         wiphy->bss_priv_size = sizeof(struct mwifiex_bss_priv);
diff --git a/drivers/net/wireless/mwifiex/scan.c b/drivers/net/wireless/mwifiex/scan.c
index 5896b1fb4a2..05965267cc2 100644
--- a/drivers/net/wireless/mwifiex/scan.c
+++ b/drivers/net/wireless/mwifiex/scan.c
@@ -1776,12 +1776,16 @@ int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
                         priv->user_scan_cfg = NULL;
                 }
         } else {
-                if (!mwifiex_wmm_lists_empty(adapter)) {
+                if (!mwifiex_wmm_lists_empty(adapter) &&
+                    (priv->scan_request && (priv->scan_request->flags &
+                                            NL80211_SCAN_FLAG_LOW_PRIORITY))) {
                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
                                                flags);
                         adapter->scan_delay_cnt = 1;
                         mod_timer(&priv->scan_delay_timer, jiffies +
                                   msecs_to_jiffies(MWIFIEX_SCAN_DELAY_MSEC));
+                        dev_dbg(priv->adapter->dev,
+                                "info: %s: deferring scan\n", __func__);
                 } else {
                         /* Get scan command from scan_pending_q and put to
                            cmd_pending_q */