netdev - [PATCH net-2.6] jme: Fix unmap error (Causing system freeze)

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Message-Id: <1311217056-9073-1-git-send-email-cooldavid@cooldavid.org>
Date:	Thu, 21 Jul 2011 10:57:36 +0800
From:	cooldavid@...ldavid.org
To:	"David Miller" <davem@...emloft.net>
Cc:	Guo-Fu Tseng <cooldavid@...ldavid.org>,
	"linux-netdev" <netdev@...r.kernel.org>,
	"Aries Lee" <arieslee@...cron.com>,
	"Devinchiu" <devinchiu@...cron.com>,
	"Jason Lamb" <jason@...bhome.org>,
	"Marcus Becker" <marcus.disi@...il.com>,
	"Marc Schiffbauer" <mschiff@...too.org>,
	"Jason Long" <jason@...gsoftware.com>, stable@...nel.org
Subject: [PATCH net-2.6] jme: Fix unmap error (Causing system freeze)

From: Guo-Fu Tseng <cooldavid@...ldavid.org>


This patch add the missing dma_unmap().
Which solved the critical issue of system freeze on heavy load.

Michal Miroslaw's rejected patch:
[PATCH v2 10/46] net: jme: convert to generic DMA API
Pointed out the issue also, thank you Michal.
But the fix was incorrect. It would unmap needed address
when low memory.

Got lots of feedback from End user and Gentoo Bugzilla.
https://bugs.gentoo.org/show_bug.cgi?id=373109
Thank you all. :)

Cc: stable@...nel.org
Signed-off-by: Guo-Fu Tseng <cooldavid@...ldavid.org>
---
 drivers/net/jme.c |   20 ++++++++++++++------
 1 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/net/jme.c b/drivers/net/jme.c
index b5b174a..1973814 100644
--- a/drivers/net/jme.c
+++ b/drivers/net/jme.c
@@ -753,20 +753,28 @@ jme_make_new_rx_buf(struct jme_adapter *jme, int i)
 	struct jme_ring *rxring = &(jme->rxring[0]);
 	struct jme_buffer_info *rxbi = rxring->bufinf + i;
 	struct sk_buff *skb;
+	dma_addr_t mapping;
 
 	skb = netdev_alloc_skb(jme->dev,
 		jme->dev->mtu + RX_EXTRA_LEN);
 	if (unlikely(!skb))
 		return -ENOMEM;
 
+	mapping = pci_map_page(jme->pdev, virt_to_page(skb->data),
+			       offset_in_page(skb->data), skb_tailroom(skb),
+			       PCI_DMA_FROMDEVICE);
+	if (unlikely(pci_dma_mapping_error(jme->pdev, mapping))) {
+		dev_kfree_skb(skb);
+		return -ENOMEM;
+	}
+
+	if (likely(rxbi->mapping))
+		pci_unmap_page(jme->pdev, rxbi->mapping,
+			       rxbi->len, PCI_DMA_FROMDEVICE);
+
 	rxbi->skb = skb;
 	rxbi->len = skb_tailroom(skb);
-	rxbi->mapping = pci_map_page(jme->pdev,
-					virt_to_page(skb->data),
-					offset_in_page(skb->data),
-					rxbi->len,
-					PCI_DMA_FROMDEVICE);
-
+	rxbi->mapping = mapping;
 	return 0;
 }
 
-- 
1.7.3.4

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