netdev - [PATCH NEXT 3/3] netxen: fix infinite loop on dma mapping failure

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Date:	Thu,  3 Sep 2009 16:10:55 -0700
From:	Dhananjay Phadke <dhananjay@...xen.com>
To:	davem@...emloft.com
Cc:	netdev@...r.kernel.org
Subject: [PATCH NEXT 3/3] netxen: fix infinite loop on dma mapping failure

Fix a perpetual while() loop in unwinding partial
mapped tx skb on dma mapping failure.

Reported-by: "Juha Leppanen" <juha_motorsportcom@...kku.com>
Signed-off-by: Dhananjay Phadke <dhananjay@...xen.com>
---
 drivers/net/netxen/netxen_nic_main.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c
index 53d57dc..41b2967 100644
--- a/drivers/net/netxen/netxen_nic_main.c
+++ b/drivers/net/netxen/netxen_nic_main.c
@@ -1577,8 +1577,8 @@ netxen_map_tx_skb(struct pci_dev *pdev,
 	return 0;
 
 unwind:
-	while (i > 0) {
-		nf = &pbuf->frag_array[i];
+	while (--i >= 0) {
+		nf = &pbuf->frag_array[i+1];
 		pci_unmap_page(pdev, nf->dma, nf->length, PCI_DMA_TODEVICE);
 	}
 
-- 
1.6.0.2

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