netdev - Re: [PATCH 1/2] e1000: Fix DMA mapping error handling on TX

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Message-ID: <4B6AC4E5.4080104@gmail.com>
Date:	Thu, 04 Feb 2010 14:00:21 +0100
From:	Roel Kluin <roel.kluin@...il.com>
To:	Roel Kluin <roel.kluin@...il.com>
CC:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>, davem@...emloft.net,
	Anton Blanchard <anton@...ba.org>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	PJ Waskiewicz <peter.p.waskiewicz.jr@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	Yi Zou <yi.zou@...el.com>,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] e1000: Fix DMA mapping error handling on TX

These functions have off by one errors in their dma mapping error cleanup
paths. We decrement count and never clean the first successfully mapped
descriptor.

Reported-by: "Anton Blanchard" <anton@...ba.org>
Reported-by: "Juha Leppanen" <juha_motorsportcom@...kku.com>
Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---
 drivers/net/e1000e/netdev.c    |    4 +---
 drivers/net/igbvf/netdev.c     |    4 +---
 drivers/net/ixgb/ixgb_main.c   |    4 +---
 drivers/net/ixgbe/ixgbe_main.c |    4 +---
 4 files changed, 4 insertions(+), 12 deletions(-)

My previous fix inadvertently introduced this change.

The e1000_tx_map() function in drivers/net/e1000/e1000_main.c is already
fixed by the patch sent by Anton Blanchard that can be found here:

http://www.mail-archive.com/e1000-devel@lists.sourceforge.net/msg02313.html

diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index 57f149b..57c3d44 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -3967,12 +3967,10 @@ static int e1000_tx_map(struct e1000_adapter *adapter,
 dma_error:
 	dev_err(&pdev->dev, "TX DMA map failed\n");
 	buffer_info->dma = 0;
-	if (count)
-		count--;
 
 	while (count--) {
 		if (i==0)
-			i += tx_ring->count;
+			i = tx_ring->count;
 		i--;
 		buffer_info = &tx_ring->buffer_info[i];
 		e1000_put_txbuf(adapter, buffer_info);;
diff --git a/drivers/net/igbvf/netdev.c b/drivers/net/igbvf/netdev.c
index 2aa71a7..3b12603 100644
--- a/drivers/net/igbvf/netdev.c
+++ b/drivers/net/igbvf/netdev.c
@@ -2164,13 +2164,11 @@ dma_error:
 	buffer_info->length = 0;
 	buffer_info->next_to_watch = 0;
 	buffer_info->mapped_as_page = false;
-	if (count)
-		count--;
 
 	/* clear timestamp and dma mappings for remaining portion of packet */
 	while (count--) {
 		if (i==0)
-			i += tx_ring->count;
+			i = tx_ring->count;
 		i--;
 		buffer_info = &tx_ring->buffer_info[i];
 		igbvf_put_txbuf(adapter, buffer_info);
diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
index 593d1a4..de9b36c 100644
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/drivers/net/ixgb/ixgb_main.c
@@ -1363,12 +1363,10 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
 dma_error:
 	dev_err(&pdev->dev, "TX DMA map failed\n");
 	buffer_info->dma = 0;
-	if (count)
-		count--;
 
 	while (count--) {
 		if (i==0)
-			i += tx_ring->count;
+			i = tx_ring->count;
 		i--;
 		buffer_info = &tx_ring->buffer_info[i];
 		ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index b5f64ad..1713258 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -5167,13 +5167,11 @@ dma_error:
 	tx_buffer_info->dma = 0;
 	tx_buffer_info->time_stamp = 0;
 	tx_buffer_info->next_to_watch = 0;
-	if (count)
-		count--;
 
 	/* clear timestamp and dma mappings for remaining portion of packet */
 	while (count--) {
 		if (i==0)
-			i += tx_ring->count;
+			i = tx_ring->count;
 		i--;
 		tx_buffer_info = &tx_ring->tx_buffer_info[i];
 		ixgbe_unmap_and_free_tx_resource(adapter, tx_buffer_info);
--
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