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i40e: add a comment on barrier and fix panic on reset 

The memory barrier used in maybe_stop_tx can use a comment.

Also add checks to VSI->rx_rings to ensure a kernel panic is not induced.

Change-ID: I48cc1bf1d6cf301818155b737edeef77c0d790c7
Change-ID: I1363a8445fbf521a26267849966296ed55f43ad8
Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Kavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Greg Rose 2013-12-18 13:45:53 +00:00 committed by Jeff Kirsher
parent 55c29c31d3
commit 8e9dca536e
2 changed files with 12 additions and 4 deletions
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15
drivers/net/ethernet/intel/i40e/i40e_main.c
View File

@ -422,7 +422,7 @@ void i40e_vsi_reset_stats(struct i40e_vsi *vsi)
memset(&vsi->net_stats_offsets, 0, sizeof(vsi->net_stats_offsets));
memset(&vsi->eth_stats, 0, sizeof(vsi->eth_stats));
memset(&vsi->eth_stats_offsets, 0, sizeof(vsi->eth_stats_offsets));
if (vsi->rx_rings)
if (vsi->rx_rings && vsi->rx_rings[0]) {
for (i = 0; i < vsi->num_queue_pairs; i++) {
memset(&vsi->rx_rings[i]->stats, 0 ,
sizeof(vsi->rx_rings[i]->stats));
@ -433,6 +433,7 @@ void i40e_vsi_reset_stats(struct i40e_vsi *vsi)
memset(&vsi->tx_rings[i]->tx_stats, 0,
sizeof(vsi->tx_rings[i]->tx_stats));
}
}
vsi->stat_offsets_loaded = false;
}
@ -2067,8 +2068,11 @@ static void i40e_vsi_free_tx_resources(struct i40e_vsi *vsi)
{
int i;
if (!vsi->tx_rings)
return;
for (i = 0; i < vsi->num_queue_pairs; i++)
if (vsi->tx_rings[i]->desc)
if (vsi->tx_rings[i] && vsi->tx_rings[i]->desc)
i40e_free_tx_resources(vsi->tx_rings[i]);
}
@ -2101,8 +2105,11 @@ static void i40e_vsi_free_rx_resources(struct i40e_vsi *vsi)
{
int i;
if (!vsi->rx_rings)
return;
for (i = 0; i < vsi->num_queue_pairs; i++)
if (vsi->rx_rings[i]->desc)
if (vsi->rx_rings[i] && vsi->rx_rings[i]->desc)
i40e_free_rx_resources(vsi->rx_rings[i]);
}
@ -5349,7 +5356,7 @@ static void i40e_vsi_clear_rings(struct i40e_vsi *vsi)
{
int i;
if (vsi->tx_rings[0]) {
if (vsi->tx_rings && vsi->tx_rings[0]) {
for (i = 0; i < vsi->alloc_queue_pairs; i++) {
kfree_rcu(vsi->tx_rings[i], rcu);
vsi->tx_rings[i] = NULL;

1
drivers/net/ethernet/intel/i40e/i40e_txrx.c
View File

@ -1715,6 +1715,7 @@ dma_error:
static inline int __i40e_maybe_stop_tx(struct i40e_ring *tx_ring, int size)
{
netif_stop_subqueue(tx_ring->netdev, tx_ring->queue_index);
/* Memory barrier before checking head and tail */
smp_mb();
/* Check again in a case another CPU has just made room available. */