linux-kernel - [PATCH 3.16 015/294] net: bcmgenet: cleanup for bcmgenet_xmit

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Date:   Mon, 06 Nov 2017 23:03:02 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Florian Fainelli" <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Petri Gynther" <pgynther@...gle.com>
Subject: [PATCH 3.16 015/294] net: bcmgenet: cleanup for bcmgenet_xmit_frag()

3.16.50-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Petri Gynther <pgynther@...gle.com>

commit 824ba603573d910e32df75fe6a5e7d7ec2a0a6a7 upstream.

Add frag_size = skb_frag_size(frag) and use it when needed.

Signed-off-by: Petri Gynther <pgynther@...gle.com>
Acked-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/ethernet/broadcom/genet/bcmgenet.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -1086,6 +1086,7 @@ static int bcmgenet_xmit_frag(struct net
 	struct bcmgenet_priv *priv = netdev_priv(dev);
 	struct device *kdev = &priv->pdev->dev;
 	struct enet_cb *tx_cb_ptr;
+	unsigned int frag_size;
 	dma_addr_t mapping;
 	int ret;
 
@@ -1093,10 +1094,12 @@ static int bcmgenet_xmit_frag(struct net
 
 	if (unlikely(!tx_cb_ptr))
 		BUG();
+
 	tx_cb_ptr->skb = NULL;
 
-	mapping = skb_frag_dma_map(kdev, frag, 0,
-		skb_frag_size(frag), DMA_TO_DEVICE);
+	frag_size = skb_frag_size(frag);
+
+	mapping = skb_frag_dma_map(kdev, frag, 0, frag_size, DMA_TO_DEVICE);
 	ret = dma_mapping_error(kdev, mapping);
 	if (ret) {
 		netif_err(priv, tx_err, dev, "%s: Tx DMA map failed\n",
@@ -1105,10 +1108,10 @@ static int bcmgenet_xmit_frag(struct net
 	}
 
 	dma_unmap_addr_set(tx_cb_ptr, dma_addr, mapping);
-	dma_unmap_len_set(tx_cb_ptr, dma_len, frag->size);
+	dma_unmap_len_set(tx_cb_ptr, dma_len, frag_size);
 
 	dmadesc_set(priv, tx_cb_ptr->bd_addr, mapping,
-			(frag->size << DMA_BUFLENGTH_SHIFT) | dma_desc_flags |
+			(frag_size << DMA_BUFLENGTH_SHIFT) | dma_desc_flags |
 			(priv->hw_params->qtag_mask << DMA_TX_QTAG_SHIFT));
 
 	return 0;