ixgbe: fix dma mapping unbalance
This issue was initially reported by Joerg Roedel <joerg.roedel@amd.com> It appears that ixgbe has had a long standing bug where it was unmapping a different size than it had mapped. ixgbe 0000:02:00.0: PCI-DMA: device driver frees DMA memory with different sizes than it mapped. ixgbe 0000:02:00.0: PCI-DMA: device driver frees DMA memory with different size [device address=0x0000000003fed812] [map size=258 bytes] [unmap size=256 bytes] Pid: 6178, comm: rmmod Not tainted 2.6.28-rc5 #4 Call Trace: [<ffffffff8022a2ae>] iommu_queue_inv_iommu_pages+0x5e/0x70 [<ffffffff80225956>] check_unmap+0x1c6/0x240 [<ffffffff80225ff5>] debug_unmap_single+0xb5/0x110 [<ffffffffa0213997>] ixgbe_clean_rx_ring+0x147/0x220 [<ffffffffa0214d7d>] ixgbe_down+0x2fd/0x3d0 [ixgbe] [<ffffffffa02150b3>] ixgbe_close+0x13/0xc0 [ixgbe] [<ffffffff80431326>] dev_close+0x56/0xa0 [<ffffffff804313b3>] rollback_registered+0x43/0x220 [<ffffffff804315a5>] unregister_netdevice+0x15/0x60 [<ffffffff80431601>] unregister_netdev+0x11/0x20 [<ffffffffa021aef8>] ixgbe_remove+0x48/0x16e [ixgbe] [<ffffffff80386ffc>] pci_device_remove+0x2c/0x60 [<ffffffff803ef929>] __device_release_driver+0x99/0x100 [<ffffffff803efa48>] driver_detach+0xb8/0xc0 [<ffffffff803eea6e>] bus_remove_driver+0x8e/0xd0 [<ffffffff80387374>] pci_unregister_driver+0x34/0x90 [<ffffffff8026c6c7>] sys_delete_module+0x1c7/0x2a0 [<ffffffff802a9ce9>] do_munmap+0x349/0x390 [<ffffffff80374481>] __up_write+0x21/0x150 [<ffffffff8020c30b>] system_call_fastpath+0x16/0x1b Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -479,7 +479,6 @@ static void ixgbe_alloc_rx_buffers(struct ixgbe_adapter *adapter,
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union ixgbe_adv_rx_desc *rx_desc;
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struct ixgbe_rx_buffer *bi;
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unsigned int i;
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unsigned int bufsz = rx_ring->rx_buf_len + NET_IP_ALIGN;
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i = rx_ring->next_to_use;
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bi = &rx_ring->rx_buffer_info[i];
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@ -508,8 +507,10 @@ static void ixgbe_alloc_rx_buffers(struct ixgbe_adapter *adapter,
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}
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if (!bi->skb) {
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struct sk_buff *skb = netdev_alloc_skb(adapter->netdev,
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bufsz);
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struct sk_buff *skb;
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skb = netdev_alloc_skb(adapter->netdev,
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(rx_ring->rx_buf_len +
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NET_IP_ALIGN));
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if (!skb) {
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adapter->alloc_rx_buff_failed++;
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@ -524,7 +525,8 @@ static void ixgbe_alloc_rx_buffers(struct ixgbe_adapter *adapter,
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skb_reserve(skb, NET_IP_ALIGN);
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bi->skb = skb;
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bi->dma = pci_map_single(pdev, skb->data, bufsz,
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bi->dma = pci_map_single(pdev, skb->data,
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rx_ring->rx_buf_len,
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PCI_DMA_FROMDEVICE);
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}
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/* Refresh the desc even if buffer_addrs didn't change because
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@ -615,7 +617,7 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_adapter *adapter,
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if (len && !skb_shinfo(skb)->nr_frags) {
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pci_unmap_single(pdev, rx_buffer_info->dma,
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rx_ring->rx_buf_len + NET_IP_ALIGN,
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rx_ring->rx_buf_len,
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PCI_DMA_FROMDEVICE);
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skb_put(skb, len);
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}
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