[PATCH net-next] net/mlx5: Fix use of uninitialized variable in bridge.c
From: Leon Romanovsky <leon@kernel.org>
Date: 2021-09-14 12:13:01
From: Leon Romanovsky <leonro@nvidia.com>
Rewrite the code to fix the following compilation warnings that were
discovered once Linus enabled -Werror flag.
drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:157:11: error:
variable 'err' is used uninitialized whenever 'if' condition is false
[-Werror,-Wsometimes-uninitialized]
else if (mlx5_esw_bridge_dev_same_hw(rep, esw))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:164:9: note:
uninitialized use occurs here
return err;
^~~
drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:157:7: note:
remove the 'if' if its condition is always true
else if (mlx5_esw_bridge_dev_same_hw(rep, esw))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:140:9: note:
initialize the variable 'err' to silence this warning
int err;
^
= 0
drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:262:7: error:
variable 'err' is used uninitialized whenever switch case is taken
[-Werror,-Wsometimes-uninitialized]
case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:276:9: note:
uninitialized use occurs here
return err;
^~~
drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:257:7: error:
variable 'err' is used uninitialized whenever 'if' condition is false
[-Werror,-Wsometimes-uninitialized]
if (attr->u.brport_flags.mask & ~(BR_LEARNING |
BR_FLOOD | BR_MCAST_FLOOD)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:276:9: note:
uninitialized use occurs here
return err;
^~~
drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:257:3: note:
remove the 'if' if its condition is always true
if (attr->u.brport_flags.mask & ~(BR_LEARNING |
BR_FLOOD | BR_MCAST_FLOOD)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:247:9: note:
initialize the variable 'err' to silence this warning
int err;
^
= 0
3 errors generated.
Fixes: ff9b7521468b ("net/mlx5: Bridge, support LAG")
Reported-by: Naresh Kamboju <redacted>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
.../mellanox/mlx5/core/en/rep/bridge.c | 36 +++++++++++--------
1 file changed, 22 insertions(+), 14 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c b/drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c
index 0c38c2e319be..55b4ce37bcae 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c@@ -137,7 +137,6 @@ static int mlx5_esw_bridge_port_changeupper(struct notifier_block *nb, void *ptr u16 vport_num, esw_owner_vhca_id; struct netlink_ext_ack *extack; int ifindex = upper->ifindex; - int err; if (!netif_is_bridge_master(upper)) return 0;
@@ -148,20 +147,29 @@ static int mlx5_esw_bridge_port_changeupper(struct notifier_block *nb, void *ptr extack = netdev_notifier_info_to_extack(&info->info); - if (mlx5_esw_bridge_is_local(dev, rep, esw)) - err = info->linking ? - mlx5_esw_bridge_vport_link(ifindex, vport_num, esw_owner_vhca_id, - br_offloads, extack) : - mlx5_esw_bridge_vport_unlink(ifindex, vport_num, esw_owner_vhca_id, - br_offloads, extack); - else if (mlx5_esw_bridge_dev_same_hw(rep, esw)) - err = info->linking ? - mlx5_esw_bridge_vport_peer_link(ifindex, vport_num, esw_owner_vhca_id, - br_offloads, extack) : - mlx5_esw_bridge_vport_peer_unlink(ifindex, vport_num, esw_owner_vhca_id, + if (mlx5_esw_bridge_is_local(dev, rep, esw)) { + if (info->linking) + return mlx5_esw_bridge_vport_link(ifindex, vport_num, + esw_owner_vhca_id, br_offloads, extack); - return err; + return mlx5_esw_bridge_vport_unlink(ifindex, vport_num, + esw_owner_vhca_id, + br_offloads, extack); + } + + if (mlx5_esw_bridge_dev_same_hw(rep, esw)) { + if (info->linking) + return mlx5_esw_bridge_vport_peer_link( + ifindex, vport_num, esw_owner_vhca_id, + br_offloads, extack); + return mlx5_esw_bridge_vport_peer_unlink(ifindex, vport_num, + esw_owner_vhca_id, + br_offloads, extack); + } + + WARN_ON(true); + return -EINVAL; } static int mlx5_esw_bridge_switchdev_port_event(struct notifier_block *nb,
@@ -244,7 +252,7 @@ mlx5_esw_bridge_port_obj_attr_set(struct net_device *dev, struct netlink_ext_ack *extack = switchdev_notifier_info_to_extack(&port_attr_info->info); const struct switchdev_attr *attr = port_attr_info->attr; u16 vport_num, esw_owner_vhca_id; - int err; + int err = 0; if (!mlx5_esw_bridge_lower_rep_vport_num_vhca_id_get(dev, br_offloads->esw, &vport_num, &esw_owner_vhca_id))
--
2.31.1