NET: sa11x0-ir: fix leak of tx skb

Ensure that we unmap and free a pending transmit skb when the interface
is stopped.  We rearrange the code a little bit to give all places a
similar layout when freeing the skb in both the completion and interface
stop paths - this gives some consistency to the code.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/drivers/net/irda/sa1100_ir.c b/drivers/net/irda/sa1100_ir.c
index adb7fea..9dc5648 100644 (file)
--- a/drivers/net/irda/sa1100_ir.c
+++ b/drivers/net/irda/sa1100_ir.c
@@ -602,9 +602,7 @@ static void sa1100_irda_txdma_irq(void *id)
 {
        struct net_device *dev = id;
        struct sa1100_irda *si = netdev_priv(dev);
-       struct sk_buff *skb = si->dma_tx.skb;
-
-       si->dma_tx.skb = NULL;
+       struct sk_buff *skb;
 
        /*
         * Wait for the transmission to complete.  Unfortunately,
@@ -636,14 +634,15 @@ static void sa1100_irda_txdma_irq(void *id)
         */
        sa1100_irda_rx_dma_start(si);
 
-       /*
-        * Account and free the packet.
-        */
+       /* Account and free the packet. */
+       skb = si->dma_tx.skb;
        if (skb) {
-               dma_unmap_single(si->dev, si->dma_tx.dma, skb->len, DMA_TO_DEVICE);
+               dma_unmap_single(si->dev, si->dma_tx.dma, skb->len,
+                                DMA_TO_DEVICE);
                dev->stats.tx_packets ++;
                dev->stats.tx_bytes += skb->len;
                dev_kfree_skb_irq(skb);
+               si->dma_tx.skb = NULL;
        }
 
        /*
@@ -841,21 +840,31 @@ err_irq:
 static int sa1100_irda_stop(struct net_device *dev)
 {
        struct sa1100_irda *si = netdev_priv(dev);
+       struct sk_buff *skb;
 
        disable_irq(dev->irq);
        sa1100_irda_shutdown(si);
 
        /*
-        * If we have been doing DMA receive, make sure we
+        * If we have been doing any DMA activity, make sure we
         * tidy that up cleanly.
         */
-       if (si->dma_rx.skb) {
+       skb = si->dma_rx.skb;
+       if (skb) {
                dma_unmap_single(si->dev, si->dma_rx.dma, HPSIR_MAX_RXLEN,
                                 DMA_FROM_DEVICE);
-               dev_kfree_skb(si->dma_rx.skb);
+               dev_kfree_skb(skb);
                si->dma_rx.skb = NULL;
        }
 
+       skb = si->dma_tx.skb;
+       if (skb) {
+               dma_unmap_single(si->dev, si->dma_tx.dma, skb->len,
+                                DMA_TO_DEVICE);
+               dev_kfree_skb(skb);
+               si->dma_tx.skb = NULL;
+       }
+
        /* Stop IrLAP */
        if (si->irlap) {
                irlap_close(si->irlap);