mwifiex: Empty Tx queue during suspend

In cfg80211 suspend handler, stop the netif queue and
wait until all the Tx queues become empty. Start the
queues in resume handler.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/marvell/mwifiex/cfg80211.c

@@ -20,6 +20,7 @@
 #include "cfg80211.h"
 #include "main.h"
 #include "11n.h"
+#include "wmm.h"
 
 static char *reg_alpha2;
 module_param(reg_alpha2, charp, 0);
@@ -3259,7 +3260,7 @@ static int mwifiex_cfg80211_suspend(struct wiphy *wiphy,
 {
 	struct mwifiex_adapter *adapter = mwifiex_cfg80211_get_adapter(wiphy);
 	struct mwifiex_ds_hs_cfg hs_cfg;
-	int i, ret = 0;
+	int i, ret = 0, retry_num = 10;
 	struct mwifiex_private *priv;
 
 	for (i = 0; i < adapter->priv_num; i++) {
@@ -3269,6 +3270,21 @@ static int mwifiex_cfg80211_suspend(struct wiphy *wiphy,
 
 	mwifiex_cancel_all_pending_cmd(adapter);
 
+	for (i = 0; i < adapter->priv_num; i++) {
+		priv = adapter->priv[i];
+		if (priv && priv->netdev)
+			mwifiex_stop_net_dev_queue(priv->netdev, adapter);
+	}
+
+	for (i = 0; i < retry_num; i++) {
+		if (!mwifiex_wmm_lists_empty(adapter) ||
+		    !mwifiex_bypass_txlist_empty(adapter) ||
+		    !skb_queue_empty(&adapter->tx_data_q))
+			usleep_range(10000, 15000);
+		else
+			break;
+	}
+
 	if (!wowlan) {
 		mwifiex_dbg(adapter, ERROR,
 			    "None of the WOWLAN triggers enabled\n");
@@ -3321,12 +3337,18 @@ static int mwifiex_cfg80211_suspend(struct wiphy *wiphy,
 static int mwifiex_cfg80211_resume(struct wiphy *wiphy)
 {
 	struct mwifiex_adapter *adapter = mwifiex_cfg80211_get_adapter(wiphy);
-	struct mwifiex_private *priv =
-		mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_STA);
+	struct mwifiex_private *priv;
 	struct mwifiex_ds_wakeup_reason wakeup_reason;
 	struct cfg80211_wowlan_wakeup wakeup_report;
 	int i;
 
+	for (i = 0; i < adapter->priv_num; i++) {
+		priv = adapter->priv[i];
+		if (priv && priv->netdev)
+			mwifiex_wake_up_net_dev_queue(priv->netdev, adapter);
+	}
+
+	priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_STA);
 	mwifiex_get_wakeup_reason(priv, HostCmd_ACT_GEN_GET, MWIFIEX_SYNC_CMD,
 				  &wakeup_reason);
 	memset(&wakeup_report, 0, sizeof(struct cfg80211_wowlan_wakeup));