ixgbe: Add a few safety nets for register writes and descriptor cleanups
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>
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@ -2458,8 +2458,10 @@ static void ixgbe_clean_rx_ring(struct ixgbe_adapter *adapter,
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rx_ring->next_to_clean = 0;
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rx_ring->next_to_use = 0;
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writel(0, adapter->hw.hw_addr + rx_ring->head);
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writel(0, adapter->hw.hw_addr + rx_ring->tail);
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if (rx_ring->head)
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writel(0, adapter->hw.hw_addr + rx_ring->head);
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if (rx_ring->tail)
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writel(0, adapter->hw.hw_addr + rx_ring->tail);
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}
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/**
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@ -2490,8 +2492,10 @@ static void ixgbe_clean_tx_ring(struct ixgbe_adapter *adapter,
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tx_ring->next_to_use = 0;
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tx_ring->next_to_clean = 0;
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writel(0, adapter->hw.hw_addr + tx_ring->head);
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writel(0, adapter->hw.hw_addr + tx_ring->tail);
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if (tx_ring->head)
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writel(0, adapter->hw.hw_addr + tx_ring->head);
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if (tx_ring->tail)
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writel(0, adapter->hw.hw_addr + tx_ring->tail);
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}
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/**
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@ -3327,7 +3331,8 @@ static void ixgbe_free_all_tx_resources(struct ixgbe_adapter *adapter)
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int i;
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for (i = 0; i < adapter->num_tx_queues; i++)
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ixgbe_free_tx_resources(adapter, &adapter->tx_ring[i]);
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if (adapter->tx_ring[i].desc)
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ixgbe_free_tx_resources(adapter, &adapter->tx_ring[i]);
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}
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/**
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@ -3363,7 +3368,8 @@ static void ixgbe_free_all_rx_resources(struct ixgbe_adapter *adapter)
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int i;
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for (i = 0; i < adapter->num_rx_queues; i++)
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ixgbe_free_rx_resources(adapter, &adapter->rx_ring[i]);
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if (adapter->rx_ring[i].desc)
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ixgbe_free_rx_resources(adapter, &adapter->rx_ring[i]);
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}
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/**
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