From: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Date: Fri, 30 May 2014 16:40:06 +0000 (-0300)
Subject: net: mvneta: Fix missing DMA region unmap
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ba7e46ef9d4550f76efb70739728c50bbf94c3a9;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

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@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 57a2e76835c0..f95e7cadb01b 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);
 	}
 }