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e1000e: fix unmap bug 

This is in reference to https://bugzilla.redhat.com/show_bug.cgi?id=484494
Also addresses issue show in kerneloops

The e1000e transmit code was calling pci_unmap_page on dma handles that it
might have called pci_map_single on.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Acked-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesse Brandeburg 2009-03-02 16:02:53 -08:00 committed by David S. Miller
parent 19147bb5f1
commit 8ddc951c73
1 changed files with 28 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
drivers/net/e1000e/netdev.c
View File

@ -566,12 +566,10 @@ next_desc:
static void e1000_put_txbuf(struct e1000_adapter *adapter,
struct e1000_buffer *buffer_info)
{
if (buffer_info->dma) {
pci_unmap_page(adapter->pdev, buffer_info->dma,
buffer_info->length, PCI_DMA_TODEVICE);
buffer_info->dma = 0;
}
buffer_info->dma = 0;
if (buffer_info->skb) {
skb_dma_unmap(&adapter->pdev->dev, buffer_info->skb,
DMA_TO_DEVICE);
dev_kfree_skb_any(buffer_info->skb);
buffer_info->skb = NULL;
}
@ -684,6 +682,11 @@ static bool e1000_clean_tx_irq(struct e1000_adapter *adapter)
* check with the clearing of time_stamp and movement of i
*/
adapter->detect_tx_hung = 0;
/*
* read barrier to make sure that the ->dma member and time
* stamp are updated fully
*/
smp_rmb();
if (tx_ring->buffer_info[eop].dma &&
time_after(jiffies, tx_ring->buffer_info[eop].time_stamp
+ (adapter->tx_timeout_factor * HZ))
@ -3820,30 +3823,31 @@ static int e1000_tx_map(struct e1000_adapter *adapter,
unsigned int mss)
{
struct e1000_ring *tx_ring = adapter->tx_ring;
struct e1000_buffer *buffer_info;
unsigned int len = skb->len - skb->data_len;
unsigned int offset = 0, size, count = 0, i;
unsigned int len = skb_headlen(skb);
unsigned int offset, size, count = 0, i;
unsigned int f;
dma_addr_t map;
i = tx_ring->next_to_use;
if (skb_dma_map(&adapter->pdev->dev, skb, DMA_TO_DEVICE)) {
dev_err(&adapter->pdev->dev, "TX DMA map failed\n");
adapter->tx_dma_failed++;
dev_kfree_skb(skb);
return -2;
}
map = skb_shinfo(skb)->dma_maps[0];
offset = 0;
while (len) {
buffer_info = &tx_ring->buffer_info[i];
struct e1000_buffer *buffer_info = &tx_ring->buffer_info[i];
size = min(len, max_per_txd);
buffer_info->length = size;
/* set time_stamp *before* dma to help avoid a possible race */
buffer_info->time_stamp = jiffies;
buffer_info->dma =
pci_map_single(adapter->pdev,
skb->data + offset,
size,
PCI_DMA_TODEVICE);
if (pci_dma_mapping_error(adapter->pdev, buffer_info->dma)) {
dev_err(&adapter->pdev->dev, "TX DMA map failed\n");
adapter->tx_dma_failed++;
return -1;
}
buffer_info->dma = map + offset;
buffer_info->next_to_watch = i;
len -= size;
@ -3859,28 +3863,17 @@ static int e1000_tx_map(struct e1000_adapter *adapter,
frag = &skb_shinfo(skb)->frags[f];
len = frag->size;
offset = frag->page_offset;
map = skb_shinfo(skb)->dma_maps[f + 1];
offset = 0;
while (len) {
struct e1000_buffer *buffer_info;
buffer_info = &tx_ring->buffer_info[i];
size = min(len, max_per_txd);
buffer_info->length = size;
buffer_info->time_stamp = jiffies;
buffer_info->dma =
pci_map_page(adapter->pdev,
frag->page,
offset,
size,
PCI_DMA_TODEVICE);
if (pci_dma_mapping_error(adapter->pdev,
buffer_info->dma)) {
dev_err(&adapter->pdev->dev,
"TX DMA page map failed\n");
adapter->tx_dma_failed++;
return -1;
}
buffer_info->dma = map + offset;
buffer_info->next_to_watch = i;
len -= size;
@ -3900,6 +3893,7 @@ static int e1000_tx_map(struct e1000_adapter *adapter,
tx_ring->buffer_info[i].skb = skb;
tx_ring->buffer_info[first].next_to_watch = i;
smp_wmb();
return count;
}