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authorAlexander Kochetkov <al.kochet@gmail.com>2016-02-09 16:20:40 +0100
committerDavid S. Miller <davem@davemloft.net>2016-02-16 21:26:30 +0100
commitb530b16413b7f99977ded50a3c4bebd2ea79c41b (patch)
tree575e01bbdec3f48308b249f2bfcbb745b56ad06f /drivers/net/ethernet/arc
parentnet: arc_emac: reset txbd_curr and txbd_dirty pointers to zero (diff)
downloadlinux-b530b16413b7f99977ded50a3c4bebd2ea79c41b.tar.xz
linux-b530b16413b7f99977ded50a3c4bebd2ea79c41b.zip
net: arc_emac: fix sk_buff leak
EMAC could be disabled, while there is some sb_buff in use. That buffers got lost for linux. In order to reproduce run on device during active ethernet work: ifconfig eth0 down Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/arc')
-rw-r--r--drivers/net/ethernet/arc/emac_main.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c
index 4f6e5be184df..6446af1403f7 100644
--- a/drivers/net/ethernet/arc/emac_main.c
+++ b/drivers/net/ethernet/arc/emac_main.c
@@ -518,6 +518,64 @@ static void arc_emac_set_rx_mode(struct net_device *ndev)
}
/**
+ * arc_free_tx_queue - free skb from tx queue
+ * @ndev: Pointer to the network device.
+ *
+ * This function must be called while EMAC disable
+ */
+static void arc_free_tx_queue(struct net_device *ndev)
+{
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+ unsigned int i;
+
+ for (i = 0; i < TX_BD_NUM; i++) {
+ struct arc_emac_bd *txbd = &priv->txbd[i];
+ struct buffer_state *tx_buff = &priv->tx_buff[i];
+
+ if (tx_buff->skb) {
+ dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr),
+ dma_unmap_len(tx_buff, len), DMA_TO_DEVICE);
+
+ /* return the sk_buff to system */
+ dev_kfree_skb_irq(tx_buff->skb);
+ }
+
+ txbd->info = 0;
+ txbd->data = 0;
+ tx_buff->skb = NULL;
+ }
+}
+
+/**
+ * arc_free_rx_queue - free skb from rx queue
+ * @ndev: Pointer to the network device.
+ *
+ * This function must be called while EMAC disable
+ */
+static void arc_free_rx_queue(struct net_device *ndev)
+{
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+ unsigned int i;
+
+ for (i = 0; i < RX_BD_NUM; i++) {
+ struct arc_emac_bd *rxbd = &priv->rxbd[i];
+ struct buffer_state *rx_buff = &priv->rx_buff[i];
+
+ if (rx_buff->skb) {
+ dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr),
+ dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE);
+
+ /* return the sk_buff to system */
+ dev_kfree_skb_irq(rx_buff->skb);
+ }
+
+ rxbd->info = 0;
+ rxbd->data = 0;
+ rx_buff->skb = NULL;
+ }
+}
+
+/**
* arc_emac_stop - Close the network device.
* @ndev: Pointer to the network device.
*
@@ -538,6 +596,10 @@ static int arc_emac_stop(struct net_device *ndev)
/* Disable EMAC */
arc_reg_clr(priv, R_CTRL, EN_MASK);
+ /* Return the sk_buff to system */
+ arc_free_tx_queue(ndev);
+ arc_free_rx_queue(ndev);
+
return 0;
}