ice: Do not enable NAPI on q_vectors that have no rings

If ice driver has q_vectors w/ active NAPI that has no rings,
then this will result in a divide by zero error. To correct it
I am updating the driver code so that we only support NAPI on
q_vectors that have 1 or more rings allocated to them.

See commit 13a8cd191a2b ("i40e: Do not enable NAPI on q_vectors
that have no rings") for detail.

Signed-off-by: Young Xiao <YangX92@hotmail.com>
Acked-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index f9f0d47..8725569 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -2564,8 +2564,12 @@ static void ice_napi_enable_all(struct ice_vsi *vsi)
        if (!vsi->netdev)
                return;
 
-       for (q_idx = 0; q_idx < vsi->num_q_vectors; q_idx++)
-               napi_enable(&vsi->q_vectors[q_idx]->napi);
+       for (q_idx = 0; q_idx < vsi->num_q_vectors; q_idx++) {
+               struct ice_q_vector *q_vector = vsi->q_vectors[q_idx];
+
+               if (q_vector->rx.ring || q_vector->tx.ring)
+                       napi_enable(&q_vector->napi);
+       }
 }
 
 /**
@@ -2932,8 +2936,12 @@ static void ice_napi_disable_all(struct ice_vsi *vsi)
        if (!vsi->netdev)
                return;
 
-       for (q_idx = 0; q_idx < vsi->num_q_vectors; q_idx++)
-               napi_disable(&vsi->q_vectors[q_idx]->napi);
+       for (q_idx = 0; q_idx < vsi->num_q_vectors; q_idx++) {
+               struct ice_q_vector *q_vector = vsi->q_vectors[q_idx];
+
+               if (q_vector->rx.ring || q_vector->tx.ring)
+                       napi_disable(&q_vector->napi);
+       }
 }
 
 /**