[PATCH 5.16 128/227] dpaa2-switch: fix default return of dpaa2_switch_flower_parse_mirror_key

Greg Kroah-Hartman
2022-02-21T09:54:59Z

From: Tom Rix <trix@redhat.com>

commit 2a36ed7c1cd55742503bed81d2cc0ea83bd0ad0c upstream.

Clang static analysis reports this representative problem
dpaa2-switch-flower.c:616:24: warning: The right operand of '=='
is a garbage value
tmp->cfg.vlan_id == vlan) {
^ ~~~~
vlan is set in dpaa2_switch_flower_parse_mirror_key(). However
this function can return success without setting vlan. So
change the default return to -EOPNOTSUPP.

Fixes: 0f3faece5808 ("dpaa2-switch: add VLAN based mirroring")
Signed-off-by: Tom Rix <trix@redhat.com>
Reviewed-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/freescale/dpaa2/dpaa2-switch-flower.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch-flower.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch-flower.c
@@ -532,6 +532,7 @@ static int dpaa2_switch_flower_parse_mir
struct flow_rule *rule = flow_cls_offload_flow_rule(cls);
struct flow_dissector *dissector = rule->match.dissector;
struct netlink_ext_ack *extack = cls->common.extack;
+ int ret = -EOPNOTSUPP;

if (dissector->used_keys &
~(BIT(FLOW_DISSECTOR_KEY_BASIC) |
@@ -561,9 +562,10 @@ static int dpaa2_switch_flower_parse_mir
}

*vlan = (u16)match.key->vlan_id;
+ ret = 0;
}

- return 0;
+ return ret;
}

static int