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ixgbe: Fix Tx map failure path

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This patch is a partial revert of "ixgbe: Don't bother clearing buffer
memory for descriptor rings". Specifically I messed up the exception
handling path a bit and this resulted in us incorrectly adding the count
back in when we didn't need to.

In order to make this simpler I am reverting most of the exception handling
path change and instead just replacing the bit that was handled by the
unmap_and_free call.

Fixes: ffed21bcee ("ixgbe: Don't bother clearing buffer memory for descriptor rings")
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alexander Duyck 2017-10-19 17:07:13 -04:00 committed by Jeff Kirsher
parent 104ba83363
commit 069db9cd0b
1 changed files with 6 additions and 12 deletions
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18
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
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@ -8020,29 +8020,23 @@ static int ixgbe_tx_map(struct ixgbe_ring *tx_ring,
return 0;
dma_error:
dev_err(tx_ring->dev, "TX DMA map failed\n");
tx_buffer = &tx_ring->tx_buffer_info[i];
/* clear dma mappings for failed tx_buffer_info map */
while (tx_buffer != first) {
for (;;) {
tx_buffer = &tx_ring->tx_buffer_info[i];
if (dma_unmap_len(tx_buffer, len))
dma_unmap_page(tx_ring->dev,
dma_unmap_addr(tx_buffer, dma),
dma_unmap_len(tx_buffer, len),
DMA_TO_DEVICE);
dma_unmap_len_set(tx_buffer, len, 0);
if (i--)
if (tx_buffer == first)
break;
if (i == 0)
i += tx_ring->count;
tx_buffer = &tx_ring->tx_buffer_info[i];
i--;
}
if (dma_unmap_len(tx_buffer, len))
dma_unmap_single(tx_ring->dev,
dma_unmap_addr(tx_buffer, dma),
dma_unmap_len(tx_buffer, len),
DMA_TO_DEVICE);
dma_unmap_len_set(tx_buffer, len, 0);
dev_kfree_skb_any(first->skb);
first->skb = NULL;