be2net: Fix invocation of be_close() after be_clear()

In the EEH error recovery path, when a permanent failure occurs,
we clean up adapter structure (i.e. destroy queues etc) by calling
be_clear() and return PCI_ERS_RESULT_DISCONNECT.
After this the stack tries to remove device from bus and calls
be_remove() which invokes netdev_unregister()->be_close().
be_close() operating on destroyed queues results in a
NULL dereference.

This patch fixes this problem by introducing a flag to keep track
of the setup state.

Signed-off-by: Kalesh AP <kalesh.purayil@emulex.com>
Signed-off-by: Sathya Perla <sathya.perla@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 9 insertions, 0 deletions

diff --git a/drivers/net/ethernet/emulex/benet/be.h b/drivers/net/ethernet/emulex/benet/be.h
index 8ccaa2520dc3..97db5a7179df 100644
--- a/drivers/net/ethernet/emulex/benet/be.h
+++ b/drivers/net/ethernet/emulex/benet/be.h
@@ -374,6 +374,7 @@ enum vf_state {
 #define BE_FLAGS_NAPI_ENABLED                   (1 << 9)
 #define BE_FLAGS_QNQ_ASYNC_EVT_RCVD             (1 << 11)
 #define BE_FLAGS_VXLAN_OFFLOADS                 (1 << 12)
+#define BE_FLAGS_SETUP_DONE                     (1 << 13)
 
 #define BE_UC_PMAC_COUNT                        30
 #define BE_VF_UC_PMAC_COUNT                     2
diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
index 80f754d7cf65..a18645407d21 100644
--- a/drivers/net/ethernet/emulex/benet/be_main.c
+++ b/drivers/net/ethernet/emulex/benet/be_main.c
@@ -2726,6 +2726,12 @@ static int be_close(struct net_device *netdev)
         struct be_eq_obj *eqo;
         int i;
 
+        /* This protection is needed as be_close() may be called even when the
+         * adapter is in cleared state (after eeh perm failure)
+         */
+        if (!(adapter->flags & BE_FLAGS_SETUP_DONE))
+                return 0;
+
         be_roce_dev_close(adapter);
 
         if (adapter->flags & BE_FLAGS_NAPI_ENABLED) {
@@ -3056,6 +3062,7 @@ static int be_clear(struct be_adapter *adapter)
         be_clear_queues(adapter);
 
         be_msix_disable(adapter);
+        adapter->flags &= ~BE_FLAGS_SETUP_DONE;
         return 0;
 }
 
@@ -3560,6 +3567,7 @@ static int be_setup(struct be_adapter *adapter)
                 adapter->phy.fc_autoneg = 1;
 
         be_schedule_worker(adapter);
+        adapter->flags |= BE_FLAGS_SETUP_DONE;
         return 0;
 err:
         be_clear(adapter);