ath9k: AR9380 PAPRD changes to improve tx performance

chromeos/compat-wireless/drivers/net/wireless/ath/ath9k/xmit.c

 /*
  * Copyright (c) 2008-2009 Atheros Communications Inc.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
@@ skipping 1614 matching lines @@
                 bf->bf_frmlen -= padsize;
         }
 
         if (!txctl->paprd && conf_is_ht(&hw->conf)) {
                 bf->bf_state.bf_type |= BUF_HT;
                 if (tx_info->flags & IEEE80211_TX_CTL_LDPC)
                         use_ldpc = true;
         }
 
         bf->bf_state.bfs_paprd = txctl->paprd;
-        if (txctl->paprd)
-                bf->bf_state.bfs_paprd_timestamp = jiffies;
         bf->bf_flags = setup_tx_flags(skb, use_ldpc);
 
         bf->bf_keytype = get_hw_crypto_keytype(skb);
         if (bf->bf_keytype != ATH9K_KEY_TYPE_CLEAR) {
                 bf->bf_frmlen += tx_info->control.hw_key->icv_len;
                 bf->bf_keyix = tx_info->control.hw_key->hw_key_idx;
         } else {
                 bf->bf_keyix = ATH9K_TXKEYIX_INVALID;
         }
 
@@ skipping 282 matching lines @@
         if (!txok) {
                 tx_flags |= ATH_TX_ERROR;
 
                 if (bf_isxretried(bf))
                         tx_flags |= ATH_TX_XRETRY;
         }
 
         dma_unmap_single(sc->dev, bf->bf_dmacontext, skb->len, DMA_TO_DEVICE);
 
         if (bf->bf_state.bfs_paprd) {
-                if (time_after(jiffies,
-                               bf->bf_state.bfs_paprd_timestamp +
-                               msecs_to_jiffies(ATH_PAPRD_TIMEOUT)))
+                if (!sc->paprd_pending)
                         dev_kfree_skb_any(skb);
                 else
                         complete(&sc->paprd_complete);
         } else {
                 ath_debug_stat_tx(sc, bf, ts);
                 ath_tx_complete(sc, skb, bf->aphy, tx_flags, txq);
 
         }
 
         /*
@@ skipping 494 matching lines @@
                         tid->ac->sched = false;
                 }
 
                 ath_tid_drain(sc, txq, tid);
                 tid->state &= ~AGGR_ADDBA_COMPLETE;
                 tid->state &= ~AGGR_CLEANUP;
 
                 spin_unlock_bh(&txq->axq_lock);
         }
 }