iwlagn: fix radar frame rejection

The microcode may sometimes reject TX frames when
on a radar channel even after we associated as it
clears information during association and needs to
receive a new beacon before allowing that channel
again. This manifests itself as a TX status value
of TX_STATUS_FAIL_PASSIVE_NO_RX. So in this case,
stop the corresponding queue and give the frame
back to mac80211 for retransmission. We start the
queue again when a beacon from the AP is received
which will make the regulatory enforcement in the
device allow transmitting again.

Signed-off-by: Garen Tamrazian <garenx.tamrazian@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-rx.c b/drivers/net/wireless/iwlwifi/iwl-rx.c
index c421f566982f..4472761fc591 100644
--- a/drivers/net/wireless/iwlwifi/iwl-rx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-rx.c
@@ -873,6 +873,7 @@ static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
 {
         struct sk_buff *skb;
         __le16 fc = hdr->frame_control;
+        struct iwl_rxon_context *ctx;
 
         /* We only process data packets if the interface is open */
         if (unlikely(!priv->is_open)) {
@@ -895,6 +896,26 @@ static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
         skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len);
 
         iwl_update_stats(priv, false, fc, len);
+
+        /*
+        * Wake any queues that were stopped due to a passive channel tx
+        * failure. This can happen because the regulatory enforcement in
+        * the device waits for a beacon before allowing transmission,
+        * sometimes even after already having transmitted frames for the
+        * association because the new RXON may reset the information.
+        */
+        if (unlikely(ieee80211_is_beacon(fc))) {
+                for_each_context(priv, ctx) {
+                        if (!ctx->last_tx_rejected)
+                                continue;
+                        if (compare_ether_addr(hdr->addr3,
+                                               ctx->active.bssid_addr))
+                                continue;
+                        ctx->last_tx_rejected = false;
+                        iwl_wake_any_queue(priv, ctx);
+                }
+        }
+
         memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
 
         ieee80211_rx(priv->hw, skb);