netdev - [net-next-2.6 PATCH 2/3] be2net: fix bad queue traversal in be_rx_q

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Message-ID: <20090810134323.GA10857@serverengines.com>
Date:	Mon, 10 Aug 2009 19:13:23 +0530
From:	Sathya Perla <sathyap@...verengines.com>
To:	netdev <netdev@...r.kernel.org>
Subject: [net-next-2.6 PATCH 2/3] be2net: fix bad queue traversal in
	be_rx_q_clean()

Using "for(tail != head)" to traverse a queue from tail to head
fails in the case of a fully filled queue. Use "for(used != 0)" instead.

Signed-off-by: Sathya Perla <sathyap@...verengines.com>
---
 drivers/net/benet/be_main.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/net/benet/be_main.c b/drivers/net/benet/be_main.c
index f7f8660..49c17ed 100644
--- a/drivers/net/benet/be_main.c
+++ b/drivers/net/benet/be_main.c
@@ -1010,7 +1010,7 @@ static void be_rx_q_clean(struct be_adapter *adapter)
 
 	/* Then free posted rx buffer that were not used */
 	tail = (rxq->head + rxq->len - atomic_read(&rxq->used)) % rxq->len;
-	for (; tail != rxq->head; index_inc(&tail, rxq->len)) {
+	for (; atomic_read(&rxq->used) > 0; index_inc(&tail, rxq->len)) {
 		page_info = get_rx_page_info(adapter, tail);
 		put_page(page_info->page);
 		memset(page_info, 0, sizeof(*page_info));
-- 
1.6.0.4

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