netdev - [PATCH 2/2] mv643xx_eth: fix recycle check bound

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Message-ID: <20081118142858.GQ5006@xi.wantstofly.org>
Date:	Tue, 18 Nov 2008 15:28:58 +0100
From:	Lennert Buytenhek <buytenh@...tstofly.org>
To:	jeff@...zik.org, netdev@...r.kernel.org
Subject: [PATCH 2/2] 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@...vell.com>

diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index 7a6b37b..4d183af 100644
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -898,7 +898,8 @@ 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);
--
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