netdev - [PATCH 4/4] batman-adv: Demote batadv-on-batadv skip error message

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Date:   Wed,  2 Mar 2022 17:35:22 +0100
From:   Simon Wunderlich <sw@...onwunderlich.de>
To:     kuba@...nel.org, davem@...emloft.net
Cc:     netdev@...r.kernel.org, b.a.t.m.a.n@...ts.open-mesh.org,
        Sven Eckelmann <sven@...fation.org>,
        Leonardo Mörlein <freifunk@...elefant.net>,
        Simon Wunderlich <sw@...onwunderlich.de>
Subject: [PATCH 4/4] batman-adv: Demote batadv-on-batadv skip error message

From: Sven Eckelmann <sven@...fation.org>

The error message "Cannot find parent device" was shown for users of
macvtap (on batadv devices) whenever the macvtap was moved to a different
netns. This happens because macvtap doesn't provide an implementation for
rtnl_link_ops->get_link_net.

The situation for which this message is printed is actually not an error
but just a warning that the optional sanity check was skipped. So demote
the message from error to warning and adjust the text to better explain
what happened.

Reported-by: Leonardo Mörlein <freifunk@...elefant.net>
Signed-off-by: Sven Eckelmann <sven@...fation.org>
Signed-off-by: Simon Wunderlich <sw@...onwunderlich.de>
---
 net/batman-adv/hard-interface.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 59d19097a54c..b25afc7ff59c 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -165,9 +165,9 @@ static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
 	/* recurse over the parent device */
 	parent_dev = __dev_get_by_index((struct net *)parent_net,
 					dev_get_iflink(net_dev));
-	/* if we got a NULL parent_dev there is something broken.. */
 	if (!parent_dev) {
-		pr_err("Cannot find parent device\n");
+		pr_warn("Cannot find parent device. Skipping batadv-on-batadv check for %s\n",
+			net_dev->name);
 		return false;
 	}
 
-- 
2.30.2