[RFC 7/9] ath10k: dma fixes for high latency devices

[Erik Stromdahl]

Several DMA related functions (such as the dma_map_xxx functions)
are not used with high latency devices and don't need to be invoked
in this case.

Signed-off-by: Erik Stromdahl <erik.stromd...@gmail.com>
---
 drivers/net/wireless/ath/ath10k/htc.c    | 13 ++++++++-----
 drivers/net/wireless/ath/ath10k/htt_rx.c |  3 ++-
 drivers/net/wireless/ath/ath10k/htt_tx.c |  3 +++
 drivers/net/wireless/ath/ath10k/txrx.c   |  5 +++--
 4 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/htc.c 
b/drivers/net/wireless/ath/ath10k/htc.c
index e5c80f5..232740c 100644
--- a/drivers/net/wireless/ath/ath10k/htc.c
+++ b/drivers/net/wireless/ath/ath10k/htc.c
@@ -137,11 +137,14 @@ int ath10k_htc_send(struct ath10k_htc *htc,
        ath10k_htc_prepare_tx_skb(ep, skb);
 
        skb_cb->eid = eid;
-       skb_cb->paddr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE);
-       ret = dma_mapping_error(dev, skb_cb->paddr);
-       if (ret) {
-               ret = -EIO;
-               goto err_credits;
+       if (!ar->is_high_latency) {
+               skb_cb->paddr = dma_map_single(dev, skb->data, skb->len,
+                                              DMA_TO_DEVICE);
+               ret = dma_mapping_error(dev, skb_cb->paddr);
+               if (ret) {
+                       ret = -EIO;
+                       goto err_credits;
+               }
        }
 
        sg_item.transfer_id = ep->eid;
diff --git a/drivers/net/wireless/ath/ath10k/htt_rx.c 
b/drivers/net/wireless/ath/ath10k/htt_rx.c
index 31654bd..e1cb754 100644
--- a/drivers/net/wireless/ath/ath10k/htt_rx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_rx.c
@@ -2484,7 +2484,8 @@ bool ath10k_htt_t2h_msg_handler(struct ath10k *ar, struct 
sk_buff *skb)
                break;
        }
        case HTT_T2H_MSG_TYPE_TX_COMPL_IND:
-               ath10k_htt_rx_tx_compl_ind(htt->ar, skb);
+               if (!ar->is_high_latency)
+                       ath10k_htt_rx_tx_compl_ind(htt->ar, skb);
                break;
        case HTT_T2H_MSG_TYPE_SEC_IND: {
                struct ath10k *ar = htt->ar;
diff --git a/drivers/net/wireless/ath/ath10k/htt_tx.c 
b/drivers/net/wireless/ath/ath10k/htt_tx.c
index e3b820d..27bbc3e 100644
--- a/drivers/net/wireless/ath/ath10k/htt_tx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_tx.c
@@ -409,6 +409,9 @@ int ath10k_htt_tx_start(struct ath10k_htt *htt)
        if (htt->tx_mem_allocated)
                return 0;
 
+       if (ar->is_high_latency)
+               return 0;
+
        ret = ath10k_htt_tx_alloc_buf(htt);
        if (ret)
                goto free_idr_pending_tx;
diff --git a/drivers/net/wireless/ath/ath10k/txrx.c 
b/drivers/net/wireless/ath/ath10k/txrx.c
index d4986f6..fae143e 100644
--- a/drivers/net/wireless/ath/ath10k/txrx.c
+++ b/drivers/net/wireless/ath/ath10k/txrx.c
@@ -90,11 +90,12 @@ int ath10k_txrx_tx_unref(struct ath10k_htt *htt,
 
        ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id);
        ath10k_htt_tx_dec_pending(htt);
-       if (htt->num_pending_tx == 0)
+       if (!ar->is_high_latency && (htt->num_pending_tx == 0))
                wake_up(&htt->empty_tx_wq);
        spin_unlock_bh(&htt->tx_lock);
 
-       dma_unmap_single(dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE);
+       if (!ar->is_high_latency)
+               dma_unmap_single(dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE);
 
        ath10k_report_offchan_tx(htt->ar, msdu);
 
-- 
2.7.4