[mcs814x] nuport-mac: close possible race condition during start

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33069 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 5 insertions, 1 deletions

diff --git a/target/linux/mcs814x/files-3.3/drivers/net/ethernet/mcs8140/nuport_mac.c b/target/linux/mcs814x/files-3.3/drivers/net/ethernet/mcs8140/nuport_mac.c
index ebf95a6533..8cd3d0e6b6 100644
--- a/target/linux/mcs814x/files-3.3/drivers/net/ethernet/mcs8140/nuport_mac.c
+++ b/target/linux/mcs814x/files-3.3/drivers/net/ethernet/mcs8140/nuport_mac.c
@@ -809,7 +809,11 @@ static int nuport_mac_open(struct net_device *dev)
 	nuport_mac_reset_rx_dma(priv);
 
 	/* Start RX DMA */
-	return nuport_mac_start_rx_dma(priv, priv->rx_skb[0]);
+	spin_lock_irqsave(&priv->lock, flags);
+	ret = nuport_mac_start_rx_dma(priv, priv->rx_skb[0]);
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	return ret;
 
 out_rx_skb:
 	nuport_mac_free_rx_ring(priv);