linux-kernel - [PATCH 4.2.y-ckt 278/305] sh_eth: fix TX buffer byte-swapping

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Message-Id: <1452902519-2754-279-git-send-email-kamal@canonical.com>
Date:	Fri, 15 Jan 2016 16:01:32 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	"David S. Miller" <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 278/305] sh_eth: fix TX buffer byte-swapping

4.2.8-ckt2 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>

commit 3e2309937f1e5d538ff13da5fb8de41196927c61 upstream.

For the little-endian SH771x kernels the driver has to byte-swap the RX/TX
buffers,  however yet unset physcial address from the TX descriptor is used
to call sh_eth_soft_swap(). Use 'skb->data' instead...

Fixes: 31fcb99d9958 ("net: sh_eth: remove __flush_purge_region")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/net/ethernet/renesas/sh_eth.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index 13463c4..675cd7f 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -2393,8 +2393,7 @@ static int sh_eth_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 	txdesc = &mdp->tx_ring[entry];
 	/* soft swap. */
 	if (!mdp->cd->hw_swap)
-		sh_eth_soft_swap(phys_to_virt(ALIGN(txdesc->addr, 4)),
-				 skb->len + 2);
+		sh_eth_soft_swap(PTR_ALIGN(skb->data, 4), skb->len + 2);
 	txdesc->addr = dma_map_single(&ndev->dev, skb->data, skb->len,
 				      DMA_TO_DEVICE);
 	if (dma_mapping_error(&ndev->dev, txdesc->addr)) {
-- 
1.9.1