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atl1e: unmap partially mapped skb on dma error and free skb 

Ben Hutchings pointed out that my recent update to atl1e
in commit 352900b583
("atl1e: fix dma mapping warnings") was missing a bit of code.

Specifically it reset the hardware tx ring to its origional state when
we hit a dma error, but didn't unmap any exiting mappings from the
operation.  This patch fixes that up.  It also remembers to free the
skb in the event that an error occurs, so we don't leak.  Untested, as
I don't have hardware.  I think its pretty straightforward, but please
review closely.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
CC: Ben Hutchings <bhutchings@solarflare.com>
CC: Jay Cliburn <jcliburn@gmail.com>
CC: Chris Snook <chris.snook@gmail.com>
CC: "David S. Miller" <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Neil Horman 2013-07-16 10:49:41 -04:00 committed by David S. Miller
parent 47188d39b5
commit 584ec43553
1 changed files with 23 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/net/ethernet/atheros/atl1e/atl1e_main.c
View File

@ -1678,6 +1678,7 @@ static int atl1e_tx_map(struct atl1e_adapter *adapter,
u16 f;
int segment;
int ring_start = adapter->tx_ring.next_to_use;
int ring_end;
nr_frags = skb_shinfo(skb)->nr_frags;
segment = (tpd->word3 >> TPD_SEGMENT_EN_SHIFT) & TPD_SEGMENT_EN_MASK;
@ -1721,6 +1722,15 @@ static int atl1e_tx_map(struct atl1e_adapter *adapter,
map_len, PCI_DMA_TODEVICE);
if (dma_mapping_error(&adapter->pdev->dev, tx_buffer->dma)) {
/* We need to unwind the mappings we've done */
ring_end = adapter->tx_ring.next_to_use;
adapter->tx_ring.next_to_use = ring_start;
while (adapter->tx_ring.next_to_use != ring_end) {
tpd = atl1e_get_tpd(adapter);
tx_buffer = atl1e_get_tx_buffer(adapter, tpd);
pci_unmap_single(adapter->pdev, tx_buffer->dma,
tx_buffer->length, PCI_DMA_TODEVICE);
}
/* Reset the tx rings next pointer */
adapter->tx_ring.next_to_use = ring_start;
return -ENOSPC;
@ -1763,6 +1773,16 @@ static int atl1e_tx_map(struct atl1e_adapter *adapter,
DMA_TO_DEVICE);
if (dma_mapping_error(&adapter->pdev->dev, tx_buffer->dma)) {
/* We need to unwind the mappings we've done */
ring_end = adapter->tx_ring.next_to_use;
adapter->tx_ring.next_to_use = ring_start;
while (adapter->tx_ring.next_to_use != ring_end) {
tpd = atl1e_get_tpd(adapter);
tx_buffer = atl1e_get_tx_buffer(adapter, tpd);
dma_unmap_page(&adapter->pdev->dev, tx_buffer->dma,
tx_buffer->length, DMA_TO_DEVICE);
}
/* Reset the ring next to use pointer */
adapter->tx_ring.next_to_use = ring_start;
return -ENOSPC;
@ -1853,8 +1873,10 @@ static netdev_tx_t atl1e_xmit_frame(struct sk_buff *skb,
return NETDEV_TX_OK;
}
if (atl1e_tx_map(adapter, skb, tpd))
if (atl1e_tx_map(adapter, skb, tpd)) {
dev_kfree_skb_any(skb);
goto out;
}
atl1e_tx_queue(adapter, tpd_req, tpd);