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| author | Vladimir Oltean <vladimir.oltean@nxp.com> | 2022-02-15 20:02:10 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-02-16 14:21:04 +0300 |
| commit | cab2cd77005187828273adfec04f3ad18a63cb3d (patch) | |
| tree | 086a66e913c60dfe577c550923f672d931d58d05 /net/bridge | |
| parent | 3116ad0696dd2bf3f53c672f44f77e0d1c2da8ca (diff) | |
| download | linux-cab2cd77005187828273adfec04f3ad18a63cb3d.tar.xz | |
net: bridge: vlan: make __vlan_add_flags react only to PVID and UNTAGGED
Currently there is a very subtle aspect to the behavior of
__vlan_add_flags(): it changes the struct net_bridge_vlan flags and
pvid, yet it returns true ("changed") even if none of those changed,
just a transition of br_vlan_is_brentry(v) took place from false to
true.
This can be seen in br_vlan_add_existing(), however we do not actually
rely on this subtle behavior, since the "if" condition that checks that
the vlan wasn't a brentry before had a useless (until now) assignment:
*changed = true;
Make things more obvious by actually making __vlan_add_flags() do what's
written on the box, and be more specific about what is actually written
on the box. This is needed because further transformations will be done
to __vlan_add_flags().
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Acked-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge')
| -rw-r--r-- | net/bridge/br_vlan.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c index 33c879c1ecf3..f9c0e034c5b4 100644 --- a/net/bridge/br_vlan.c +++ b/net/bridge/br_vlan.c @@ -58,7 +58,9 @@ static bool __vlan_delete_pvid(struct net_bridge_vlan_group *vg, u16 vid) return true; } -/* return true if anything changed, false otherwise */ +/* Returns true if the BRIDGE_VLAN_INFO_PVID and BRIDGE_VLAN_INFO_UNTAGGED bits + * of @flags produced any change onto @v, false otherwise + */ static bool __vlan_add_flags(struct net_bridge_vlan *v, u16 flags) { struct net_bridge_vlan_group *vg; @@ -80,7 +82,7 @@ static bool __vlan_add_flags(struct net_bridge_vlan *v, u16 flags) else v->flags &= ~BRIDGE_VLAN_INFO_UNTAGGED; - return ret || !!(old_flags ^ v->flags); + return ret || !!((old_flags ^ v->flags) & BRIDGE_VLAN_INFO_UNTAGGED); } static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br, |