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 <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/mv643xx_eth.c

···
 		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);