i40e: Fix NULL ptr dereference on VSI filter sync

Remove the reason of null pointer dereference in sync VSI filters.
Added new I40E_VSI_RELEASING flag to signalize deleting and releasing
of VSI resources to sync this thread with sync filters subtask.
Without this patch it is possible to start update the VSI filter list
after VSI is removed, that's causing a kernel oops.

Fixes: 398a4d9906b4 ("i40e: main driver core")
Signed-off-by: Grzegorz Szczurek <grzegorzx.szczurek@intel.com>
Signed-off-by: Michal Maloszewski <michal.maloszewski@intel.com>
Reviewed-by: Przemyslaw Patynowski <przemyslawx.patynowski@intel.com>
Reviewed-by: Witold Fijalkowski <witoldx.fijalkowski@intel.com>
Reviewed-by: Jaroslaw Gawin <jaroslawx.gawin@intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Tested-by: Tony Brelinski <tony.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
index 3d528fba754b4cce4553bcab13f08add22e42b5c..35a83a161b6f7f20f46cb898c52ed53b5c86abfa 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -161,6 +161,7 @@ enum i40e_vsi_state_t {
        __I40E_VSI_OVERFLOW_PROMISC,
        __I40E_VSI_REINIT_REQUESTED,
        __I40E_VSI_DOWN_REQUESTED,
+       __I40E_VSI_RELEASING,
        /* This must be last as it determines the size of the BITMAP */
        __I40E_VSI_STATE_SIZE__,
 };

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index ba862131b9bdf2c51bc664703177eda072dd0a47..6e309d6ce37dc933efd4425a5f1d8ae2cb456fdb 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -2623,7 +2623,8 @@ static void i40e_sync_filters_subtask(struct i40e_pf *pf)
 
        for (v = 0; v < pf->num_alloc_vsi; v++) {
                if (pf->vsi[v] &&
-                   (pf->vsi[v]->flags & I40E_VSI_FLAG_FILTER_CHANGED)) {
+                   (pf->vsi[v]->flags & I40E_VSI_FLAG_FILTER_CHANGED) &&
+                   !test_bit(__I40E_VSI_RELEASING, pf->vsi[v]->state)) {
                        int ret = i40e_sync_vsi_filters(pf->vsi[v]);
 
                        if (ret) {
@@ -13771,7 +13772,7 @@ int i40e_vsi_release(struct i40e_vsi *vsi)
                dev_info(&pf->pdev->dev, "Can't remove PF VSI\n");
                return -ENODEV;
        }
-
+       set_bit(__I40E_VSI_RELEASING, vsi->state);
        uplink_seid = vsi->uplink_seid;
        if (vsi->type != I40E_VSI_SRIOV) {
                if (vsi->netdev_registered) {