From: Brandeburg, Jesse Date: Tue, 30 Sep 2008 13:08:48 +0000 (+0000) Subject: ixgb: fix bug when freeing resources X-Git-Tag: MMI-PSA29.97-13-9~31818^2~62 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=23e55a32ca1ffdbe7a492ef99f0e0ac48e504a13;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git ixgb: fix bug when freeing resources It was pointed out by Breno Leitao 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 Signed-off-by: Jesse Brandeburg Signed-off-by: David S. Miller --- 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; } }