igb: resolve panic on shutdown when SR-IOV is enabled

The setup_rctl call was making a call into the ring structure after it had
been freed.  This was causing a panic on shutdown.  This call wasn't
necessary since it is possible to get the needed index from
adapter->vfs_allocated_count.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 7 deletions

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 08c801490c72..e25343588fc7 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -2006,7 +2006,7 @@ static void igb_setup_rctl(struct igb_adapter *adapter)
         struct e1000_hw *hw = &adapter->hw;
         u32 rctl;
         u32 srrctl = 0;
-        int i, j;
+        int i;
 
         rctl = rd32(E1000_RCTL);
 
@@ -2071,8 +2071,6 @@ static void igb_setup_rctl(struct igb_adapter *adapter)
         if (adapter->vfs_allocated_count) {
                 u32 vmolr;
 
-                j = adapter->rx_ring[0].reg_idx;
-
                 /* set all queue drop enable bits */
                 wr32(E1000_QDE, ALL_QUEUES);
                 srrctl |= E1000_SRRCTL_DROP_EN;
@@ -2080,16 +2078,16 @@ static void igb_setup_rctl(struct igb_adapter *adapter)
                 /* disable queue 0 to prevent tail write w/o re-config */
                 wr32(E1000_RXDCTL(0), 0);
 
-                vmolr = rd32(E1000_VMOLR(j));
+                vmolr = rd32(E1000_VMOLR(adapter->vfs_allocated_count));
                 if (rctl & E1000_RCTL_LPE)
                         vmolr |= E1000_VMOLR_LPE;
-                if (adapter->num_rx_queues > 0)
+                if (adapter->num_rx_queues > 1)
                         vmolr |= E1000_VMOLR_RSSE;
-                wr32(E1000_VMOLR(j), vmolr);
+                wr32(E1000_VMOLR(adapter->vfs_allocated_count), vmolr);
         }
 
         for (i = 0; i < adapter->num_rx_queues; i++) {
-                j = adapter->rx_ring[i].reg_idx;
+                int j = adapter->rx_ring[i].reg_idx;
                 wr32(E1000_SRRCTL(j), srrctl);
         }