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i40evf: check rings before freeing resources

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[ Upstream commit fdb47ae87a ]

If the driver gets unloaded during reset recovery, it's possible
that it will attempt to free resources when they're already free.

Add a check to make sure that the Tx and Rx rings actually exist
before dereferencing them to free resources.

Change-ID: I4d2b7e9ede49f634d421a4c5deaa5446bc755eee
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mitch Williams
2015-11-19 11:34:18 -08:00
committed by Greg Kroah-Hartman
parent 796adc8527
commit 0af31973b5
1 changed files with 6 additions and 0 deletions
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6
drivers/net/ethernet/intel/i40evf/i40evf_main.c
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@@ -1864,6 +1864,9 @@ void i40evf_free_all_tx_resources(struct i40evf_adapter *adapter)
{
int i;
if (!adapter->tx_rings)
return;
for (i = 0; i < adapter->num_active_queues; i++)
if (adapter->tx_rings[i]->desc)
i40evf_free_tx_resources(adapter->tx_rings[i]);
@@ -1932,6 +1935,9 @@ void i40evf_free_all_rx_resources(struct i40evf_adapter *adapter)
{
int i;
if (!adapter->rx_rings)
return;
for (i = 0; i < adapter->num_active_queues; i++)
if (adapter->rx_rings[i]->desc)
i40evf_free_rx_resources(adapter->rx_rings[i]);