From: Lino Sanfilippo Date: Wed, 30 Nov 2016 22:48:31 +0000 (+0100) Subject: net: ethernet: altera: TSE: Remove unneeded dma sync for tx buffers X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=151a14db228181fb49abaf83e13f3be58ec102c4;p=linux-beck.git net: ethernet: altera: TSE: Remove unneeded dma sync for tx buffers 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. Signed-off-by: Lino Sanfilippo Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/altera/altera_tse_main.c b/drivers/net/ethernet/altera/altera_tse_main.c index 6532829b70d2..28689092ff19 100644 --- a/drivers/net/ethernet/altera/altera_tse_main.c +++ b/drivers/net/ethernet/altera/altera_tse_main.c @@ -400,12 +400,6 @@ static int tse_rx(struct altera_tse_private *priv, int limit) skb_put(skb, pktlength); - /* make cache consistent with receive packet buffer */ - dma_sync_single_for_cpu(priv->device, - priv->rx_ring[entry].dma_addr, - priv->rx_ring[entry].len, - DMA_FROM_DEVICE); - dma_unmap_single(priv->device, priv->rx_ring[entry].dma_addr, priv->rx_ring[entry].len, DMA_FROM_DEVICE); @@ -592,10 +586,6 @@ static int tse_start_xmit(struct sk_buff *skb, struct net_device *dev) buffer->dma_addr = dma_addr; buffer->len = nopaged_len; - /* Push data out of the cache hierarchy into main memory */ - dma_sync_single_for_device(priv->device, buffer->dma_addr, - buffer->len, DMA_TO_DEVICE); - priv->dmaops->tx_buffer(priv, buffer); skb_tx_timestamp(skb);