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neighbour: restore protocol != 0 check in pneigh update

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Prior to commit dc2a27e524 ("neighbour: Update pneigh_entry in
pneigh_create()."), a pneigh's protocol was updated only when the
value of the NDA_PROTOCOL attribute was non-0. While moving the code,
that check was removed. This is a small change of user-visible
behavior, and inconsistent with the (non-proxy) neighbour behavior.

Fixes: dc2a27e524 ("neighbour: Update pneigh_entry in pneigh_create().")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/38c61de1bb032871a886aff9b9b52fe1cdd4cada.1772894876.git.sd@queasysnail.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Sabrina Dubroca
2026-03-10 22:59:16 +01:00
committed by Jakub Kicinski
parent e8f0dc024c
commit cbada10488
1 changed files with 2 additions and 1 deletions
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3
net/core/neighbour.c
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@@ -820,7 +820,8 @@ int pneigh_create(struct neigh_table *tbl, struct net *net,
update:
WRITE_ONCE(n->flags, flags);
n->permanent = permanent;
WRITE_ONCE(n->protocol, protocol);
if (protocol)
WRITE_ONCE(n->protocol, protocol);
out:
mutex_unlock(&tbl->phash_lock);
return err;