An explicit dma sync for device directly after mapping as well as an explicit dma sync for cpu directly before unmapping is unnecessary and costly on the hotpath. So remove these calls.
Unified · Split
| @@ -400,12 +400,6 @@ static int tse_rx(struct altera_tse_private *priv, int limit) · 399 unmodified lines | ||
| 400 | 400 | |
| 401 | 401 | skb_put(skb, pktlength); |
| 402 | 402 | |
| 403 | − /* make cache consistent with receive packet buffer */ | |
| 404 | − dma_sync_single_for_cpu(priv->device, | |
| 405 | − priv->rx_ring[entry].dma_addr, | |
| 406 | − priv->rx_ring[entry].len, | |
| 407 | − DMA_FROM_DEVICE); | |
| 408 | − | |
| 409 | 403 | dma_unmap_single(priv->device, priv->rx_ring[entry].dma_addr, |
| 410 | 404 | priv->rx_ring[entry].len, DMA_FROM_DEVICE); |
| 411 | 405 | |
| @@ -592,10 +586,6 @@ static int tse_start_xmit(struct sk_buff *skb, struct net_device *dev) · 180 unmodified lines | ||
| 592 | 586 | buffer->dma_addr = dma_addr; |
| 593 | 587 | buffer->len = nopaged_len; |
| 594 | 588 | |
| 595 | − /* Push data out of the cache hierarchy into main memory */ | |
| 596 | − dma_sync_single_for_device(priv->device, buffer->dma_addr, | |
| 597 | − buffer->len, DMA_TO_DEVICE); | |
| 598 | − | |
| 599 | 589 | priv->dmaops->tx_buffer(priv, buffer); |
| 600 | 590 | |
| 601 | 591 | skb_tx_timestamp(skb); |