mwifiex: drop block-ack action frames

We often see ADDBA request packets coming to driver because driver
has registered for action frame subtype. We dont process BA action
frames in host; drop such frames.

Signed-off-by: Avinash Patil <patila@marvell.com>
Signed-off-by: Xinmin Hu <huxm@marvell.com>
Signed-off-by: Cathy Luo <cluo@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/mwifiex/util.c

@@ -329,7 +329,7 @@ mwifiex_parse_mgmt_packet(struct mwifiex_private *priv, u8 *payload, u16 len,
 			  struct rxpd *rx_pd)
 {
 	u16 stype;
-	u8 category, action_code;
+	u8 category, action_code, *addr2;
 	struct ieee80211_hdr *ieee_hdr = (void *)payload;
 
 	stype = (le16_to_cpu(ieee_hdr->frame_control) & IEEE80211_FCTL_STYPE);
@@ -337,21 +337,35 @@ mwifiex_parse_mgmt_packet(struct mwifiex_private *priv, u8 *payload, u16 len,
 	switch (stype) {
 	case IEEE80211_STYPE_ACTION:
 		category = *(payload + sizeof(struct ieee80211_hdr));
-		action_code = *(payload + sizeof(struct ieee80211_hdr) + 1);
-		if (category == WLAN_CATEGORY_PUBLIC &&
-		    action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
+		switch (category) {
+		case WLAN_CATEGORY_PUBLIC:
+			action_code = *(payload + sizeof(struct ieee80211_hdr)
+					+ 1);
+			if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
+				addr2 = ieee_hdr->addr2;
+				mwifiex_dbg(priv->adapter, INFO,
+					    "TDLS discovery response %pM nf=%d, snr=%d\n",
+					    addr2, rx_pd->nf, rx_pd->snr);
+				mwifiex_auto_tdls_update_peer_signal(priv,
+								     addr2,
+								     rx_pd->snr,
+								     rx_pd->nf);
+			}
+			break;
+		case WLAN_CATEGORY_BACK:
+			/*we dont indicate BACK action frames to cfg80211*/
+			mwifiex_dbg(priv->adapter, INFO,
+				    "drop BACK action frames");
+			return -1;
+		default:
 			mwifiex_dbg(priv->adapter, INFO,
-				    "TDLS discovery response %pM nf=%d, snr=%d\n",
-				    ieee_hdr->addr2, rx_pd->nf, rx_pd->snr);
-			mwifiex_auto_tdls_update_peer_signal(priv,
-							     ieee_hdr->addr2,
-							     rx_pd->snr,
-							     rx_pd->nf);
+				    "unknown public action frame category %d\n",
+				    category);
 		}
-		break;
 	default:
 		mwifiex_dbg(priv->adapter, INFO,
-			    "unknown mgmt frame subtype %#x\n", stype);
+		    "unknown mgmt frame subtype %#x\n", stype);
+		return 0;
 	}
 
 	return 0;
@@ -387,8 +401,9 @@ mwifiex_process_mgmt_packet(struct mwifiex_private *priv,
 
 	ieee_hdr = (void *)skb->data;
 	if (ieee80211_is_mgmt(ieee_hdr->frame_control)) {
-		mwifiex_parse_mgmt_packet(priv, (u8 *)ieee_hdr,
-					  pkt_len, rx_pd);
+		if (mwifiex_parse_mgmt_packet(priv, (u8 *)ieee_hdr,
+					      pkt_len, rx_pd))
+			return -1;
 	}
 	/* Remove address4 */
 	memmove(skb->data + sizeof(struct ieee80211_hdr_3addr),