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net/mlx5e: Fix free peer_flow when refcount is 0

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commit eb252c3a24fc5856fa62140c2f8269ddce6ce4e5 upstream.

It could be neigh update flow took a refcount on peer flow so
sometimes we cannot release peer flow even if parent flow is
being freed now.

Fixes: 5a7e5bcb66 ("net/mlx5e: Extend tc flow struct with reference counter")
Signed-off-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Eli Britstein <elibr@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Roi Dayan 2019-12-02 19:19:47 +02:00 • committed by Greg Kroah-Hartman
commit 142cb2bd61
1 changed files with 5 additions and 2 deletions
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7
drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
View file

@ -1615,8 +1615,11 @@ static void __mlx5e_tc_del_fdb_peer_flow(struct mlx5e_tc_flow *flow)
flow_flag_clear(flow, DUP);
mlx5e_tc_del_fdb_flow(flow->peer_flow->priv, flow->peer_flow);
kfree(flow->peer_flow);
if (refcount_dec_and_test(&flow->peer_flow->refcnt)) {
mlx5e_tc_del_fdb_flow(flow->peer_flow->priv, flow->peer_flow);
kfree(flow->peer_flow);
}
flow->peer_flow = NULL;
}