netdev - [PATCH 4/8] ethoc: prevent overflow of rx counter

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Date:	Wed, 24 Nov 2010 14:40:54 +0100
From:	Jonas Bonn <jonas@...thpole.se>
To:	netdev@...r.kernel.org
Cc:	Jonas Bonn <jonas@...thpole.se>
Subject: [PATCH 4/8] ethoc: prevent overflow of rx counter

Rewind cur_rx to prevent it from overflowing.

Signed-off-by: Jonas Bonn <jonas@...thpole.se>
---
 drivers/net/ethoc.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ethoc.c b/drivers/net/ethoc.c
index 53c03f2..7d1b5d8 100644
--- a/drivers/net/ethoc.c
+++ b/drivers/net/ethoc.c
@@ -408,6 +408,9 @@ static int ethoc_rx(struct net_device *dev, int limit)
 	struct ethoc *priv = netdev_priv(dev);
 	int count;
 
+	/* Prevent overflow of priv->cur_rx by rewinding it */	
+	priv->cur_rx = priv->cur_rx % priv->num_rx;
+
 	for (count = 0; count < limit; ++count) {
 		unsigned int entry;
 		struct ethoc_bd bd;
-- 
1.7.1

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