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mlxsw: spectrum_span: Do not dereference destination netdev 

Currently, the destination netdev to which we mirror must be a valid
netdev. However, this is going to change with the introduction of
mirroring towards the CPU port, as the CPU port does not have a backing
netdev.

Avoid dereferencing the destination netdev when it is not clear if it is
valid or not.

Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2020-07-14 17:20:58 +03:00 committed by David S. Miller
parent f4a626e2ca
commit 6edc8beab4
1 changed files with 3 additions and 4 deletions
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7
drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
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@ -692,16 +692,15 @@ mlxsw_sp_span_entry_configure(struct mlxsw_sp *mlxsw_sp,
goto set_parms;
if (sparms.dest_port->mlxsw_sp != mlxsw_sp) {
netdev_err(span_entry->to_dev, "Cannot mirror to %s, which belongs to a different mlxsw instance",
sparms.dest_port->dev->name);
dev_err(mlxsw_sp->bus_info->dev,
"Cannot mirror to a port which belongs to a different mlxsw instance\n");
sparms.dest_port = NULL;
goto set_parms;
}
err = span_entry->ops->configure(span_entry, sparms);
if (err) {
netdev_err(span_entry->to_dev, "Failed to offload mirror to %s",
sparms.dest_port->dev->name);
dev_err(mlxsw_sp->bus_info->dev, "Failed to offload mirror\n");
sparms.dest_port = NULL;
goto set_parms;
}