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 57a2e76..f95e7ca 100644 (file)
--- 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);
        }
 }