[net-next 05/11] ice: Avoid nested RTNL locking in ice_dis_vsi

[Jeff Kirsher]

From: Dave Ertman <david.m.ert...@intel.com>

ice_dis_vsi() performs an rtnl_lock() if it detects a netdev that is
running on the VSI. In cases where the RTNL lock has already been
acquired, a deadlock results. Add a boolean to pass to ice_dis_vsi to
tell it if the RTNL lock is already held.

Signed-off-by: Dave Ertman <david.m.ert...@intel.com>
Signed-off-by: Anirudh Venkataramanan <anirudh.venkatarama...@intel.com>
Tested-by: Andrew Bowers <andrewx.bow...@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_main.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c 
b/drivers/net/ethernet/intel/ice/ice_main.c
index ea79e5e1f589..089b0f0b2e71 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -3137,8 +3137,9 @@ static void ice_vsi_release_all(struct ice_pf *pf)
 /**
  * ice_dis_vsi - pause a VSI
  * @vsi: the VSI being paused
+ * @locked: is the rtnl_lock already held
  */
-static void ice_dis_vsi(struct ice_vsi *vsi)
+static void ice_dis_vsi(struct ice_vsi *vsi, bool locked)
 {
        if (test_bit(__ICE_DOWN, vsi->state))
                return;
@@ -3147,9 +3148,13 @@ static void ice_dis_vsi(struct ice_vsi *vsi)
 
        if (vsi->type == ICE_VSI_PF && vsi->netdev) {
                if (netif_running(vsi->netdev)) {
-                       rtnl_lock();
-                       vsi->netdev->netdev_ops->ndo_stop(vsi->netdev);
-                       rtnl_unlock();
+                       if (!locked) {
+                               rtnl_lock();
+                               vsi->netdev->netdev_ops->ndo_stop(vsi->netdev);
+                               rtnl_unlock();
+                       } else {
+                               vsi->netdev->netdev_ops->ndo_stop(vsi->netdev);
+                       }
                } else {
                        ice_vsi_close(vsi);
                }
@@ -3188,7 +3193,7 @@ static void ice_pf_dis_all_vsi(struct ice_pf *pf)
 
        ice_for_each_vsi(pf, v)
                if (pf->vsi[v])
-                       ice_dis_vsi(pf->vsi[v]);
+                       ice_dis_vsi(pf->vsi[v], false);
 }
 
 /**
-- 
2.19.1