netdev - [PATCH 3/8] net: mvneta: Fix missing DMA region unmap

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Message-Id: <1401468011-10609-4-git-send-email-ezequiel.garcia@free-electrons.com>
Date:	Fri, 30 May 2014 13:40:06 -0300
From:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
To:	<netdev@...r.kernel.org>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	Lior Amsalem <alior@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>, fugang.duan@...escale.com,
	Willy Tarreau <w@....eu>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
Subject: [PATCH 3/8] net: mvneta: Fix missing DMA region unmap

The Tx descriptor release code currently calls dma_unmap_single() and
dev_kfree_skb_any() if the descriptor is associated with a non-NULL skb.
This is true only for the last fragment of the packet.

This is wrong, however, since every descriptor buffer is DMA mapped and needs
to be unmapped.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
---
 drivers/net/ethernet/marvell/mvneta.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 57a2e76..f95e7ca 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -1291,11 +1291,10 @@ static void mvneta_txq_bufs_free(struct mvneta_port *pp,
 
 		mvneta_txq_inc_get(txq);
 
-		if (!skb)
-			continue;
-
 		dma_unmap_single(pp->dev->dev.parent, tx_desc->buf_phys_addr,
 				 tx_desc->data_size, DMA_TO_DEVICE);
+		if (!skb)
+			continue;
 		dev_kfree_skb_any(skb);
 	}
 }
-- 
1.9.1

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