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igb: cleanup code related to ring resource allocation and free

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This patch cleans up some of the ring alloc and free code to better handle
exceptions such as attempting to free resources on an already freed ring.

Signed-off-by: Alexander Duyck <alexander.h.duyck@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:
Alexander Duyck 2009-10-27 23:49:20 +00:00 committed by David S. Miller
parent f7ba205e82
commit 439705e1d7
1 changed files with 17 additions and 12 deletions
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29
drivers/net/igb/igb_main.c
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@ -1952,7 +1952,8 @@ int igb_setup_tx_resources(struct igb_ring *tx_ring)
tx_ring->size = tx_ring->count * sizeof(union e1000_adv_tx_desc);
tx_ring->size = ALIGN(tx_ring->size, 4096);
tx_ring->desc = pci_alloc_consistent(pdev, tx_ring->size,
tx_ring->desc = pci_alloc_consistent(pdev,
tx_ring->size,
&tx_ring->dma);
if (!tx_ring->desc)
@ -1978,13 +1979,13 @@ err:
**/
static int igb_setup_all_tx_resources(struct igb_adapter *adapter)
{
struct pci_dev *pdev = adapter->pdev;
int i, err = 0;
int r_idx;
for (i = 0; i < adapter->num_tx_queues; i++) {
err = igb_setup_tx_resources(&adapter->tx_ring[i]);
if (err) {
dev_err(&adapter->pdev->dev,
dev_err(&pdev->dev,
"Allocation for Tx Queue %u failed\n", i);
for (i--; i >= 0; i--)
igb_free_tx_resources(&adapter->tx_ring[i]);
@ -1993,7 +1994,7 @@ static int igb_setup_all_tx_resources(struct igb_adapter *adapter)
}
for (i = 0; i < IGB_MAX_TX_QUEUES; i++) {
r_idx = i % adapter->num_tx_queues;
int r_idx = i % adapter->num_tx_queues;
adapter->multi_tx_table[i] = &adapter->tx_ring[r_idx];
}
return err;
@ -2116,6 +2117,7 @@ int igb_setup_rx_resources(struct igb_ring *rx_ring)
err:
vfree(rx_ring->buffer_info);
rx_ring->buffer_info = NULL;
dev_err(&pdev->dev, "Unable to allocate memory for "
"the receive descriptor ring\n");
return -ENOMEM;
@ -2130,12 +2132,13 @@ err:
**/
static int igb_setup_all_rx_resources(struct igb_adapter *adapter)
{
struct pci_dev *pdev = adapter->pdev;
int i, err = 0;
for (i = 0; i < adapter->num_rx_queues; i++) {
err = igb_setup_rx_resources(&adapter->rx_ring[i]);
if (err) {
dev_err(&adapter->pdev->dev,
dev_err(&pdev->dev,
"Allocation for Rx Queue %u failed\n", i);
for (i--; i >= 0; i--)
igb_free_rx_resources(&adapter->rx_ring[i]);
@ -2476,6 +2479,10 @@ void igb_free_tx_resources(struct igb_ring *tx_ring)
vfree(tx_ring->buffer_info);
tx_ring->buffer_info = NULL;
/* if not set, then don't free */
if (!tx_ring->desc)
return;
pci_free_consistent(tx_ring->pdev, tx_ring->size,
tx_ring->desc, tx_ring->dma);
@ -2534,14 +2541,10 @@ static void igb_clean_tx_ring(struct igb_ring *tx_ring)
memset(tx_ring->buffer_info, 0, size);
/* Zero out the descriptor ring */
memset(tx_ring->desc, 0, tx_ring->size);
tx_ring->next_to_use = 0;
tx_ring->next_to_clean = 0;
writel(0, tx_ring->head);
writel(0, tx_ring->tail);
}
/**
@ -2569,6 +2572,10 @@ void igb_free_rx_resources(struct igb_ring *rx_ring)
vfree(rx_ring->buffer_info);
rx_ring->buffer_info = NULL;
/* if not set, then don't free */
if (!rx_ring->desc)
return;
pci_free_consistent(rx_ring->pdev, rx_ring->size,
rx_ring->desc, rx_ring->dma);
@ -2601,6 +2608,7 @@ static void igb_clean_rx_ring(struct igb_ring *rx_ring)
if (!rx_ring->buffer_info)
return;
/* Free all the Rx ring sk_buffs */
for (i = 0; i < rx_ring->count; i++) {
buffer_info = &rx_ring->buffer_info[i];
@ -2638,9 +2646,6 @@ static void igb_clean_rx_ring(struct igb_ring *rx_ring)
rx_ring->next_to_clean = 0;
rx_ring->next_to_use = 0;
writel(0, rx_ring->head);
writel(0, rx_ring->tail);
}
/**