net/mlx5: E-Switch, Unload the representors in the correct order

[ Upstream commit 191220396db840822fc818edf03c49f0c02eb237 ]

When changing from switchdev to legacy mode, all the representor port
devices (uplink nic and reps) are cleaned up. Part of this cleaning
process is removing the neigh entries and the hash table containing them.
However, a representor neigh entry might be linked to the uplink port
hash table and if the uplink nic is cleaned first the cleaning of the
representor will end up in null deref.
Fix that by unloading the representors in the opposite order of load.

Fixes: cb67b832921c ("net/mlx5e: Introduce SRIOV VF representors")
Signed-off-by: Shahar Klein <shahark@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
index a53e982a68634b5129324fb5af58776804fc5853..f28750bb56d6d0e55d0bef09dff47037ce3baee9 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
@@ -818,7 +818,7 @@ void esw_offloads_cleanup(struct mlx5_eswitch *esw, int nvports)
        struct mlx5_eswitch_rep *rep;
        int vport;
 
-       for (vport = 0; vport < nvports; vport++) {
+       for (vport = nvports - 1; vport >= 0; vport--) {
                rep = &esw->offloads.vport_reps[vport];
                if (!rep->valid)
                        continue;