[net 3/4] ice: protect ring accesses with WRITE_ONCE

[Jeff Kirsher]

From: Ciara Loftus <ciara.lof...@intel.com>

The READ_ONCE macro is used when reading rings prior to accessing the
statistics pointer. The corresponding WRITE_ONCE usage when allocating and
freeing the rings to ensure protected access was not in place. Introduce
this.

Signed-off-by: Ciara Loftus <ciara.lof...@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_lib.c  | 8 ++++----
 drivers/net/ethernet/intel/ice/ice_main.c | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c 
b/drivers/net/ethernet/intel/ice/ice_lib.c
index 28b46cc9f5cb..2e3a39cea2c0 100644
--- a/drivers/net/ethernet/intel/ice/ice_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_lib.c
@@ -1194,7 +1194,7 @@ static void ice_vsi_clear_rings(struct ice_vsi *vsi)
                for (i = 0; i < vsi->alloc_txq; i++) {
                        if (vsi->tx_rings[i]) {
                                kfree_rcu(vsi->tx_rings[i], rcu);
-                               vsi->tx_rings[i] = NULL;
+                               WRITE_ONCE(vsi->tx_rings[i], NULL);
                        }
                }
        }
@@ -1202,7 +1202,7 @@ static void ice_vsi_clear_rings(struct ice_vsi *vsi)
                for (i = 0; i < vsi->alloc_rxq; i++) {
                        if (vsi->rx_rings[i]) {
                                kfree_rcu(vsi->rx_rings[i], rcu);
-                               vsi->rx_rings[i] = NULL;
+                               WRITE_ONCE(vsi->rx_rings[i], NULL);
                        }
                }
        }
@@ -1235,7 +1235,7 @@ static int ice_vsi_alloc_rings(struct ice_vsi *vsi)
                ring->vsi = vsi;
                ring->dev = dev;
                ring->count = vsi->num_tx_desc;
-               vsi->tx_rings[i] = ring;
+               WRITE_ONCE(vsi->tx_rings[i], ring);
        }
 
        /* Allocate Rx rings */
@@ -1254,7 +1254,7 @@ static int ice_vsi_alloc_rings(struct ice_vsi *vsi)
                ring->netdev = vsi->netdev;
                ring->dev = dev;
                ring->count = vsi->num_rx_desc;
-               vsi->rx_rings[i] = ring;
+               WRITE_ONCE(vsi->rx_rings[i], ring);
        }
 
        return 0;
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c 
b/drivers/net/ethernet/intel/ice/ice_main.c
index 082825e3cb39..4cbd49c87568 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -1702,7 +1702,7 @@ static int ice_xdp_alloc_setup_rings(struct ice_vsi *vsi)
                xdp_ring->netdev = NULL;
                xdp_ring->dev = dev;
                xdp_ring->count = vsi->num_tx_desc;
-               vsi->xdp_rings[i] = xdp_ring;
+               WRITE_ONCE(vsi->xdp_rings[i], xdp_ring);
                if (ice_setup_tx_ring(xdp_ring))
                        goto free_xdp_rings;
                ice_set_ring_xdp(xdp_ring);
-- 
2.26.2