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ixgbe: Add a few safety nets for register writes and descriptor cleanups

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There are possible times that a driver may fail to completely initialize,
due to a buggy platform or a buggy kernel.  In those cases, we'd rather
fail gracefully instead of a panic.  Add a few safety checks to some
critical paths to try and prevent a panic in these corner-case situations.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@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 2009-03-13 22:14:50 +00:00 committed by David S. Miller
parent 2a41ff8116
commit 9891ca7cdc
1 changed files with 12 additions and 6 deletions
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18
drivers/net/ixgbe/ixgbe_main.c
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@ -2458,8 +2458,10 @@ static void ixgbe_clean_rx_ring(struct ixgbe_adapter *adapter,
rx_ring->next_to_clean = 0;
rx_ring->next_to_use = 0;
writel(0, adapter->hw.hw_addr + rx_ring->head);
writel(0, adapter->hw.hw_addr + rx_ring->tail);
if (rx_ring->head)
writel(0, adapter->hw.hw_addr + rx_ring->head);
if (rx_ring->tail)
writel(0, adapter->hw.hw_addr + rx_ring->tail);
}
/**
@ -2490,8 +2492,10 @@ static void ixgbe_clean_tx_ring(struct ixgbe_adapter *adapter,
tx_ring->next_to_use = 0;
tx_ring->next_to_clean = 0;
writel(0, adapter->hw.hw_addr + tx_ring->head);
writel(0, adapter->hw.hw_addr + tx_ring->tail);
if (tx_ring->head)
writel(0, adapter->hw.hw_addr + tx_ring->head);
if (tx_ring->tail)
writel(0, adapter->hw.hw_addr + tx_ring->tail);
}
/**
@ -3327,7 +3331,8 @@ static void ixgbe_free_all_tx_resources(struct ixgbe_adapter *adapter)
int i;
for (i = 0; i < adapter->num_tx_queues; i++)
ixgbe_free_tx_resources(adapter, &adapter->tx_ring[i]);
if (adapter->tx_ring[i].desc)
ixgbe_free_tx_resources(adapter, &adapter->tx_ring[i]);
}
/**
@ -3363,7 +3368,8 @@ static void ixgbe_free_all_rx_resources(struct ixgbe_adapter *adapter)
int i;
for (i = 0; i < adapter->num_rx_queues; i++)
ixgbe_free_rx_resources(adapter, &adapter->rx_ring[i]);
if (adapter->rx_ring[i].desc)
ixgbe_free_rx_resources(adapter, &adapter->rx_ring[i]);
}
/**