netdev - [PATCH v2 net-next 3/6] net: dsa: move switchdev event implementation under the same switch/case statement

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Message-Id: <20201213024018.772586-4-vladimir.oltean@nxp.com>
Date:   Sun, 13 Dec 2020 04:40:15 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bridge@...ts.linux-foundation.org,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     DENG Qingfang <dqfext@...il.com>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        Marek Behun <marek.behun@....cz>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Alexandra Winter <wintera@...ux.ibm.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ido Schimmel <idosch@...sch.org>,
        Claudiu Manoil <claudiu.manoil@....com>
Subject: [PATCH v2 net-next 3/6] net: dsa: move switchdev event implementation under the same switch/case statement

We'll need to start listening to SWITCHDEV_FDB_{ADD,DEL}_TO_DEVICE
events even for interfaces where dsa_slave_dev_check returns false, so
we need that check inside the switch-case statement for SWITCHDEV_FDB_*.

This movement also avoids a useless allocation / free of switchdev_work
on the untreated "default event" case.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
Changes in v2:
None.

 net/dsa/slave.c | 35 ++++++++++++++++-------------------
 1 file changed, 16 insertions(+), 19 deletions(-)

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 5079308a0206..99907e76770b 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -2116,31 +2116,29 @@ static int dsa_slave_switchdev_event(struct notifier_block *unused,
 	struct dsa_port *dp;
 	int err;
 
-	if (event == SWITCHDEV_PORT_ATTR_SET) {
+	switch (event) {
+	case SWITCHDEV_PORT_ATTR_SET:
 		err = switchdev_handle_port_attr_set(dev, ptr,
 						     dsa_slave_dev_check,
 						     dsa_slave_port_attr_set);
 		return notifier_from_errno(err);
-	}
-
-	if (!dsa_slave_dev_check(dev))
-		return NOTIFY_DONE;
+	case SWITCHDEV_FDB_ADD_TO_DEVICE:
+	case SWITCHDEV_FDB_DEL_TO_DEVICE:
+		if (!dsa_slave_dev_check(dev))
+			return NOTIFY_DONE;
 
-	dp = dsa_slave_to_port(dev);
+		dp = dsa_slave_to_port(dev);
 
-	switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
-	if (!switchdev_work)
-		return NOTIFY_BAD;
+		switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
+		if (!switchdev_work)
+			return NOTIFY_BAD;
 
-	INIT_WORK(&switchdev_work->work,
-		  dsa_slave_switchdev_event_work);
-	switchdev_work->ds = dp->ds;
-	switchdev_work->port = dp->index;
-	switchdev_work->event = event;
+		INIT_WORK(&switchdev_work->work,
+			  dsa_slave_switchdev_event_work);
+		switchdev_work->ds = dp->ds;
+		switchdev_work->port = dp->index;
+		switchdev_work->event = event;
 
-	switch (event) {
-	case SWITCHDEV_FDB_ADD_TO_DEVICE:
-	case SWITCHDEV_FDB_DEL_TO_DEVICE:
 		fdb_info = ptr;
 
 		if (!fdb_info->added_by_user) {
@@ -2153,13 +2151,12 @@ static int dsa_slave_switchdev_event(struct notifier_block *unused,
 		switchdev_work->vid = fdb_info->vid;
 
 		dev_hold(dev);
+		dsa_schedule_work(&switchdev_work->work);
 		break;
 	default:
-		kfree(switchdev_work);
 		return NOTIFY_DONE;
 	}
 
-	dsa_schedule_work(&switchdev_work->work);
 	return NOTIFY_OK;
 }
 
-- 
2.25.1