netdev - [PATCH 5/16] Spidernet RX skb mem leak

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Message-ID: <20061206233449.GE4649@austin.ibm.com>
Date:	Wed, 6 Dec 2006 17:34:49 -0600
From:	linas@...tin.ibm.com (Linas Vepstas)
To:	Andrew Morton <akpm@...l.org>
Cc:	jgarzik@...ox.com, netdev@...r.kernel.org, linuxppc-dev@...abs.org,
	James K Lewis <jklewis@...ibm.com>,
	Arnd Bergmann <arnd@...db.de>,
	Geoff Levand <geoffrey.levand@...sony.com>
Subject: [PATCH 5/16] Spidernet RX skb mem leak


One of the unlikely error branches has an skb memory leak.
Fix this by handling the error conditions consistently.

Signed-off-by: Linas Vepstas <linas@...tin.ibm.com>
Cc: James K Lewis <jklewis@...ibm.com>
Cc: Arnd Bergmann <arnd@...db.de>

----
 drivers/net/spider_net.c |   18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

Index: linux-2.6.19-git7/drivers/net/spider_net.c
===================================================================
--- linux-2.6.19-git7.orig/drivers/net/spider_net.c	2006-12-06 16:02:58.000000000 -0600
+++ linux-2.6.19-git7/drivers/net/spider_net.c	2006-12-06 16:03:00.000000000 -0600
@@ -884,8 +884,8 @@ spider_net_do_ioctl(struct net_device *n
  *
  * returns 1 on success, 0 if no packet was passed to the stack
  *
- * iommu-unmaps the skb, fills out skb structure and passes the data to the
- * stack. The descriptor state is not changed.
+ * Fills out skb structure and passes the data to the stack.
+ * The descriptor state is not changed.
  */
 static int
 spider_net_pass_skb_up(struct spider_net_descr *descr,
@@ -900,10 +900,6 @@ spider_net_pass_skb_up(struct spider_net
 
 	netdev = card->netdev;
 
-	/* unmap descriptor */
-	pci_unmap_single(card->pdev, descr->buf_addr, SPIDER_NET_MAX_FRAME,
-			PCI_DMA_FROMDEVICE);
-
 	/* the cases we'll throw away the packet immediately */
 	if (data_error & SPIDER_NET_DESTROY_RX_FLAGS) {
 		if (netif_msg_rx_err(card))
@@ -998,6 +994,11 @@ spider_net_decode_one_descr(struct spide
 	spin_unlock_irqrestore(&chain->lock, flags);
 
 	result = 0;
+
+	/* unmap descriptor */
+	pci_unmap_single(card->pdev, descr->buf_addr,
+			SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
+
 	if ( (status == SPIDER_NET_DESCR_RESPONSE_ERROR) ||
 	     (status == SPIDER_NET_DESCR_PROTECTION_ERROR) ||
 	     (status == SPIDER_NET_DESCR_FORCE_END) ) {
@@ -1005,8 +1006,6 @@ spider_net_decode_one_descr(struct spide
 			pr_err("%s: dropping RX descriptor with state %d\n",
 			       card->netdev->name, status);
 		card->netdev_stats.rx_dropped++;
-		pci_unmap_single(card->pdev, descr->buf_addr,
-				SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
 		dev_kfree_skb_irq(descr->skb);
 		goto refill;
 	}
@@ -1014,9 +1013,10 @@ spider_net_decode_one_descr(struct spide
 	if ( (status != SPIDER_NET_DESCR_COMPLETE) &&
 	     (status != SPIDER_NET_DESCR_FRAME_END) ) {
 		if (netif_msg_rx_err(card))
-			pr_err("%s: RX descriptor with state %d\n",
+			pr_err("%s: RX descriptor with unkown state %d\n",
 			       card->netdev->name, status);
 		card->spider_stats.rx_desc_unk_state++;
+		dev_kfree_skb_irq(descr->skb);
 		goto refill;
 	}
 
-
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