mv643xx_eth: fix recycle check bound

When mv643xx_eth allocates skbuffs, it adds
'dma_get_cache_alignment() - 1' to the length it needs, so that it can
align the skb's ->data pointer to a cache boundary.  When checking
whether a transmitted skbuff can be reused as a receive buffer, these
bytes needs to be included into the minimum bound for the recycle check.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index baa7e845a011..e513f76f2a9f 100644
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -899,7 +899,8 @@ static int txq_reclaim(struct tx_queue *txq, int budget, int force)
                 if (skb != NULL) {
                         if (skb_queue_len(&mp->rx_recycle) <
                                         mp->default_rx_ring_size &&
-                            skb_recycle_check(skb, mp->skb_size))
+                            skb_recycle_check(skb, mp->skb_size +
+                                        dma_get_cache_alignment() - 1))
                                 __skb_queue_head(&mp->rx_recycle, skb);
                         else
                                 dev_kfree_skb(skb);