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>

diff --git a/drivers/net/ethernet/emulex/benet/be.h b/drivers/net/ethernet/emulex/benet/be.h
index 8ccaa25..97db5a7 100644 (file)
--- 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 80f754d..a186454 100644 (file)
--- 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);