netdev - [PATCH 4/4] e1000e: Not initialize the e1000_ps_page array when packet-split is not used

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Message-Id: <1369037707-27026-5-git-send-email-weiyang@linux.vnet.ibm.com>
Date:	Mon, 20 May 2013 16:15:07 +0800
From:	Wei Yang <weiyang@...ux.vnet.ibm.com>
To:	jeffrey.t.kirsher@...el.com
Cc:	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org,
	Wei Yang <weiyang@...ux.vnet.ibm.com>
Subject: [PATCH 4/4] e1000e: Not initialize the e1000_ps_page array when packet-split is not used

When packet split is not used, those fields are still initialized and memory
is allocated for them.

This patch check whether packet split is used and do the initialization base
on the status.

Signed-off-by: Wei Yang <weiyang@...ux.vnet.ibm.com>
---
 drivers/net/ethernet/intel/e1000e/netdev.c |   38 ++++++++++++++-------------
 1 files changed, 20 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index a2e8a53..c75d9cf 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -1690,15 +1690,17 @@ static void e1000_clean_rx_ring(struct e1000_ring *rx_ring)
 			buffer_info->skb = NULL;
 		}
 
-		for (j = 0; j < PS_PAGE_BUFFERS; j++) {
-			ps_page = &buffer_info->ps_pages[j];
-			if (!ps_page->page)
-				break;
-			dma_unmap_page(&pdev->dev, ps_page->dma, PAGE_SIZE,
-				       DMA_FROM_DEVICE);
-			ps_page->dma = 0;
-			put_page(ps_page->page);
-			ps_page->page = NULL;
+		if (adapter->rx_ps_pages) {
+			for (j = 0; j < PS_PAGE_BUFFERS; j++) {
+				ps_page = &buffer_info->ps_pages[j];
+				if (!ps_page->page)
+					break;
+				dma_unmap_page(&pdev->dev, ps_page->dma, PAGE_SIZE,
+					       DMA_FROM_DEVICE);
+				ps_page->dma = 0;
+				put_page(ps_page->page);
+				ps_page->page = NULL;
+			}
 		}
 	}
 
@@ -2355,16 +2357,16 @@ int e1000e_setup_rx_resources(struct e1000_ring *rx_ring)
 	if (!rx_ring->buffer_info)
 		goto err;
 
-	for (i = 0; i < rx_ring->count; i++) {
-		buffer_info = &rx_ring->buffer_info[i];
-		buffer_info->ps_pages = kcalloc(PS_PAGE_BUFFERS,
-						sizeof(struct e1000_ps_page),
-						GFP_KERNEL);
-		if (!buffer_info->ps_pages)
-			goto err_pages;
-	}
-
 	if (adapter->rx_ps_pages) {
+		for (i = 0; i < rx_ring->count; i++) {
+			buffer_info = &rx_ring->buffer_info[i];
+			buffer_info->ps_pages = kcalloc(PS_PAGE_BUFFERS,
+							sizeof(struct e1000_ps_page),
+							GFP_KERNEL);
+			if (!buffer_info->ps_pages)
+				goto err_pages;
+		}
+
 		/* this is a 32 byte descriptor */
 		desc_len = sizeof(union e1000_rx_desc_packet_split);
 	} else {
-- 
1.7.5.4

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