From 23e55a32ca1ffdbe7a492ef99f0e0ac48e504a13 Mon Sep 17 00:00:00 2001
From: "Brandeburg, Jesse" <jesse.brandeburg@intel.com>
Date: Tue, 30 Sep 2008 13:08:48 +0000
Subject: [PATCH] ixgb: fix bug when freeing resources
It was pointed out by Breno Leitao <leitao@linux.vnet.ibm.com> that
ixgb would crash on PPC when an IOMMU was in use, if change_mtu was
called.
It appears to be a pretty simple issue in the driver that wasn't discovered
because most systems don't run with an IOMMU. The driver needs to only unmap
buffers that are mapped (duh).
CC: Breno Leitao <leitao@linux.vnet.ibm.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/ixgb/ixgb_main.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
index aa75385cd6c7..be3c7dc96f63 100644
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/drivers/net/ixgb/ixgb_main.c
@@ -977,15 +977,17 @@ ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
for (i = 0; i < rx_ring->count; i++) {
buffer_info = &rx_ring->buffer_info[i];
- if (buffer_info->skb) {
-
+ if (buffer_info->dma) {
pci_unmap_single(pdev,
buffer_info->dma,
buffer_info->length,
PCI_DMA_FROMDEVICE);
+ buffer_info->dma = 0;
+ buffer_info->length = 0;
+ }
+ if (buffer_info->skb) {
dev_kfree_skb(buffer_info->skb);
-
buffer_info->skb = NULL;
}
}
--
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