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i40e: prevent null pointer exception in dump descriptor 

Check that rings were allocated before trying to reference them.

Change-Id: I33151e55ab7a7a305fecdb88ccb2709ac246b7c7
Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Shannon Nelson 2013-11-26 10:49:26 +00:00 committed by Jeff Kirsher
parent 3753cb240b
commit 29d0790ef3
1 changed files with 6 additions and 0 deletions
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6
drivers/net/ethernet/intel/i40e/i40e_debugfs.c
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@ -782,6 +782,12 @@ static void i40e_dbg_dump_desc(int cnt, int vsi_seid, int ring_id, int desc_n,
dev_info(&pf->pdev->dev, "dump desc tx <vsi_seid> <ring_id> [<desc_n>]\n");
return;
}
if (!vsi->tx_rings) {
dev_info(&pf->pdev->dev,
"descriptor rings have not been allocated for vsi %d\n",
vsi_seid);
return;
}
if (is_rx_ring)
ring = *vsi->rx_rings[ring_id];
else