netdev - [NET-NEXT PATCH 07/25] ixgb: move time stamp set before setting dma pointer

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Message-ID: <20080708225137.6925.95442.stgit@localhost.localdomain>
Date:	Tue, 08 Jul 2008 15:51:37 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	jeff@...zik.org
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [NET-NEXT PATCH 07/25] ixgb: move time stamp set before setting dma
	pointer

From: Jesse Brandeburg <jesse.brandeburg@...el.com>

a user pointed out that setting variables out of order with respect
to the checks we make for tx timeout handling could result in a race
where ->dma was set but ->time_stamp was set to the old value.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---

 drivers/net/ixgb/ixgb_main.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
index 0e72dad..4bf6bbc 100644
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/drivers/net/ixgb/ixgb_main.c
@@ -1290,12 +1290,12 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
 
 		buffer_info->length = size;
 		WARN_ON(buffer_info->dma != 0);
+		buffer_info->time_stamp = jiffies;
 		buffer_info->dma =
 			pci_map_single(adapter->pdev,
 				skb->data + offset,
 				size,
 				PCI_DMA_TODEVICE);
-		buffer_info->time_stamp = jiffies;
 		buffer_info->next_to_watch = 0;
 
 		len -= size;
@@ -1322,13 +1322,13 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
 				size -= 4;
 
 			buffer_info->length = size;
+			buffer_info->time_stamp = jiffies;
 			buffer_info->dma =
 				pci_map_page(adapter->pdev,
 					frag->page,
 					frag->page_offset + offset,
 					size,
 					PCI_DMA_TODEVICE);
-			buffer_info->time_stamp = jiffies;
 			buffer_info->next_to_watch = 0;
 
 			len -= size;

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