netdev - [NET-NEXT PATCH 2/3] igb: simplify swap in clean_rx

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Message-ID: <20081118020531.10912.66635.stgit@gitlost.lost>
Date:	Mon, 17 Nov 2008 18:05:31 -0800
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, jeff@...zik.org,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [NET-NEXT PATCH 2/3] igb: simplify swap in clean_rx_irq if using
	packet split

From: Alexander Duyck <alexander.h.duyck@...el.com>

This update replaces the xchg calls that were added with a pair of
assignments as there is no need for the xchg calls and they were found to
cause issues on some architectures.

Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---

 drivers/net/igb/igb_main.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 89ffc07..c298ae8 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -3921,8 +3921,10 @@ send_up:
 		next_buffer = &rx_ring->buffer_info[i];
 
 		if (!(staterr & E1000_RXD_STAT_EOP)) {
-			buffer_info->skb = xchg(&next_buffer->skb, skb);
-			buffer_info->dma = xchg(&next_buffer->dma, 0);
+			buffer_info->skb = next_buffer->skb;
+			buffer_info->dma = next_buffer->dma;
+			next_buffer->skb = skb;
+			next_buffer->dma = 0;
 			goto next_desc;
 		}
 

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