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authorJesse Brandeburg <jesse.brandeburg@intel.com>2009-06-30 12:45:34 +0000
committerDavid S. Miller <davem@davemloft.net>2009-06-30 19:46:58 -0700
commit679be3ba0c493eb66d22c206273729ce50925e85 (patch)
tree0248f05b482e2877009c89ec6c70d7dfbd3ae7e5 /drivers
parent91615f765a2935b6cbae424b9eee1585ed681ae6 (diff)
downloadlinux-679be3ba0c493eb66d22c206273729ce50925e85.tar.bz2
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] [<ffffffff8123056f>] ? check_unmap+0x14e/0x577 [ 121.781201] [<ffffffff81057a19>] warn_slowpath_common+0x77/0x8f [ 121.781205] [<ffffffff81057ae1>] warn_slowpath_fmt+0x9f/0xa1 [ 121.781212] [<ffffffff81477ce2>] ? _spin_lock_irqsave+0x3f/0x49 [ 121.781216] [<ffffffff8122fa97>] ? get_hash_bucket+0x28/0x33 [ 121.781220] [<ffffffff8123056f>] check_unmap+0x14e/0x577 [ 121.781225] [<ffffffff810e4f48>] ? check_bytes_and_report+0x38/0xcb [ 121.781230] [<ffffffff81230bbf>] debug_dma_unmap_page+0x80/0x92 [ 121.781234] [<ffffffff8122e549>] ? unmap_single+0x1a/0x4e [ 121.781239] [<ffffffff813901e1>] ? __kfree_skb+0x74/0x78 [ 121.781250] [<ffffffffa00662ef>] pci_unmap_single+0x64/0x6d [e1000] [ 121.781259] [<ffffffffa0066344>] e1000_clean_rx_ring+0x4c/0xbf [e1000] [ 121.781268] [<ffffffffa00663df>] e1000_clean_all_rx_rings+0x28/0x36 [e1000] [ 121.781277] [<ffffffffa0067464>] e1000_down+0x138/0x141 [e1000] [ 121.781286] [<ffffffffa00681c2>] __e1000_shutdown+0x6b/0x198 [e1000] [ 121.781296] [<ffffffffa0068405>] e1000_suspend+0x17/0x50 [e1000] [ 121.781301] [<ffffffff81237665>] pci_legacy_suspend+0x3b/0xbe [ 121.781305] [<ffffffff81237bc6>] pci_pm_suspend+0x3e/0xf1 [ 121.781310] [<ffffffff812eaf1c>] pm_op+0x57/0xde [ 121.781314] [<ffffffff812eb444>] dpm_suspend_start+0x31e/0x470 [ 121.781319] [<ffffffff810877da>] suspend_devices_and_enter+0x3e/0x1a2 [ 121.781323] [<ffffffff81087a0f>] enter_state+0xd1/0x127 [ 121.781327] [<ffffffff8108717a>] state_store+0xa7/0xc9 [ 121.781332] [<ffffffff81221843>] kobj_attr_store+0x17/0x19 [ 121.781336] [<ffffffff8113c01e>] sysfs_write_file+0xe5/0x121 [ 121.781341] [<ffffffff810ed165>] vfs_write+0xab/0x105 [ 121.781344] [<ffffffff810ed279>] sys_write+0x47/0x6d [ 121.781349] [<ffffffff81027aab>] 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 <jesse.brandeburg@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/e1000/e1000_main.c8
1 files changed, 7 insertions, 1 deletions
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 */
}