From: Sathya Perla <sathyap@serverengines.com>
Date: Mon, 10 Aug 2009 03:43:23 +0000 (+0000)
Subject: be2net: fix bad queue traversal in be_rx_q_clean()
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=cdab23b7017693c00dd69fa28bcdf5b0434b3838;p=openwrt%2Fstaging%2Fblogic.git

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@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/benet/be_main.c b/drivers/net/benet/be_main.c
index acce6a639324..9bbf447ee28f 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));