From 679be3ba0c493eb66d22c206273729ce50925e85 Mon Sep 17 00:00:00 2001 From: Jesse Brandeburg Date: Tue, 30 Jun 2009 12:45:34 +0000 Subject: [PATCH] e1000: fix unmap bug as reported by kerneloops.org [ 121.781161] ------------[ cut here ]------------ [ 121.781171] WARNING: at lib/dma-debug.c:793 check_unmap+0x14e/0x577() [ 121.781173] Hardware name: S5520HC [ 121.781177] e1000 0000:0a:00.0: DMA-API: device driver tries to free DMA memory it has not allocated [device address=0x00000001d688b0fa] [size=1522 bytes] [ 121.781180] Modules linked in: e1000 mdio dca [last unloaded: ixgbe] [ 121.781187] Pid: 4793, comm: bash Tainted: P 2.6.30-master-06161113 #3 [ 121.781190] Call Trace: [ 121.781195] [] ? check_unmap+0x14e/0x577 [ 121.781201] [] warn_slowpath_common+0x77/0x8f [ 121.781205] [] warn_slowpath_fmt+0x9f/0xa1 [ 121.781212] [] ? _spin_lock_irqsave+0x3f/0x49 [ 121.781216] [] ? get_hash_bucket+0x28/0x33 [ 121.781220] [] check_unmap+0x14e/0x577 [ 121.781225] [] ? check_bytes_and_report+0x38/0xcb [ 121.781230] [] debug_dma_unmap_page+0x80/0x92 [ 121.781234] [] ? unmap_single+0x1a/0x4e [ 121.781239] [] ? __kfree_skb+0x74/0x78 [ 121.781250] [] pci_unmap_single+0x64/0x6d [e1000] [ 121.781259] [] e1000_clean_rx_ring+0x4c/0xbf [e1000] [ 121.781268] [] e1000_clean_all_rx_rings+0x28/0x36 [e1000] [ 121.781277] [] e1000_down+0x138/0x141 [e1000] [ 121.781286] [] __e1000_shutdown+0x6b/0x198 [e1000] [ 121.781296] [] e1000_suspend+0x17/0x50 [e1000] [ 121.781301] [] pci_legacy_suspend+0x3b/0xbe [ 121.781305] [] pci_pm_suspend+0x3e/0xf1 [ 121.781310] [] pm_op+0x57/0xde [ 121.781314] [] dpm_suspend_start+0x31e/0x470 [ 121.781319] [] suspend_devices_and_enter+0x3e/0x1a2 [ 121.781323] [] enter_state+0xd1/0x127 [ 121.781327] [] state_store+0xa7/0xc9 [ 121.781332] [] kobj_attr_store+0x17/0x19 [ 121.781336] [] sysfs_write_file+0xe5/0x121 [ 121.781341] [] vfs_write+0xab/0x105 [ 121.781344] [] sys_write+0x47/0x6d [ 121.781349] [] system_call_fastpath+0x16/0x1b [ 121.781352] ---[ end trace 97bacaaac2ed7786 ]--- Fix is to correctly zero out internal ->dma value when unmapping and make sure never to unmap unless there specifically was a mapping done. Signed-off-by: Jesse Brandeburg Signed-off-by: Jeff Kirsher Signed-off-by: David S. Miller --- drivers/net/e1000/e1000_main.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c index 5e3356f8eb5a..972e06d984c8 100644 --- a/drivers/net/e1000/e1000_main.c +++ b/drivers/net/e1000/e1000_main.c @@ -2185,12 +2185,16 @@ static void e1000_clean_rx_ring(struct e1000_adapter *adapter, /* Free all the Rx ring sk_buffs */ 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; + + if (buffer_info->skb) { dev_kfree_skb(buffer_info->skb); buffer_info->skb = NULL; } @@ -4033,6 +4037,7 @@ static bool e1000_clean_rx_irq(struct e1000_adapter *adapter, buffer_info->dma, buffer_info->length, PCI_DMA_FROMDEVICE); + buffer_info->dma = 0; length = le16_to_cpu(rx_desc->length); /* !EOP means multiple descriptors were used to store a single @@ -4222,6 +4227,7 @@ map_skb: pci_unmap_single(pdev, buffer_info->dma, adapter->rx_buffer_len, PCI_DMA_FROMDEVICE); + buffer_info->dma = 0; break; /* while !buffer_info->skb */ } -- 2.20.1