netdev - [PATCH v3 net-next 2/9] net: dsa: don't stop at NOTIFY_OK when calling ds->ops->port

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Date:   Fri, 19 Aug 2022 20:48:13 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vladimir Oltean <olteanv@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com,
        Colin Foster <colin.foster@...advantage.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>
Subject: [PATCH v3 net-next 2/9] net: dsa: don't stop at NOTIFY_OK when calling ds->ops->port_prechangeupper

dsa_slave_prechangeupper_sanity_check() is supposed to enforce some
adjacency restrictions, and calls ds->ops->port_prechangeupper if the
driver implements it.

We convert the error code from the port_prechangeupper() call to a
notifier code, and 0 is converted to NOTIFY_OK, but the caller of
dsa_slave_prechangeupper_sanity_check() stops at any notifier code
different from NOTIFY_DONE.

Avoid this by converting back the notifier code to an error code, so
that both NOTIFY_OK and NOTIFY_DONE will be seen as 0. This allows more
parallel sanity check functions to be added.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
---
v1->v3: none

 net/dsa/slave.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 2f0400a696fc..008bbe1c0285 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -2710,7 +2710,7 @@ static int dsa_slave_netdevice_event(struct notifier_block *nb,
 		int err;
 
 		err = dsa_slave_prechangeupper_sanity_check(dev, info);
-		if (err != NOTIFY_DONE)
+		if (notifier_to_errno(err))
 			return err;
 
 		err = dsa_slave_prechangeupper(dev, ptr);
-- 
2.34.1