netdev - [PATCH net-next v4 3/8] net: lan966x: Flush fdb workqueue when port is leaving a bridge.

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Date:   Wed, 17 Aug 2022 21:34:44 +0200
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
CC:     <UNGLinuxDriver@...rochip.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <linux@...linux.org.uk>, <vladimir.oltean@....com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>
Subject: [PATCH net-next v4 3/8] net: lan966x: Flush fdb workqueue when port is leaving a bridge.

Whenever a port leaves a bridge, flush the workqueue of the FDB work.

Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
---
 drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c     | 9 +++++----
 drivers/net/ethernet/microchip/lan966x/lan966x_main.h    | 1 +
 .../net/ethernet/microchip/lan966x/lan966x_switchdev.c   | 7 ++++---
 3 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c b/drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c
index c760f73c0621..5142e7c0de31 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c
@@ -128,6 +128,11 @@ void lan966x_fdb_deinit(struct lan966x *lan966x)
 	lan966x_fdb_purge_entries(lan966x);
 }
 
+void lan966x_fdb_flush_workqueue(struct lan966x *lan966x)
+{
+	flush_workqueue(lan966x->fdb_work);
+}
+
 static void lan966x_fdb_port_event_work(struct lan966x_fdb_event_work *fdb_work)
 {
 	struct switchdev_notifier_fdb_info *fdb_info;
@@ -205,8 +210,6 @@ static void lan966x_fdb_event_work(struct work_struct *work)
 		lan966x_fdb_bridge_event_work(fdb_work);
 
 	kfree(fdb_work->fdb_info.addr);
-	dev_put(fdb_work->dev);
-	dev_put(fdb_work->orig_dev);
 	kfree(fdb_work);
 }
 
@@ -244,8 +247,6 @@ int lan966x_handle_fdb(struct net_device *dev,
 			goto err_addr_alloc;
 
 		ether_addr_copy((u8 *)fdb_work->fdb_info.addr, fdb_info->addr);
-		dev_hold(dev);
-		dev_hold(orig_dev);
 
 		queue_work(lan966x->fdb_work, &fdb_work->work);
 		break;
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
index 2787055c1847..b02c1c803945 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
@@ -369,6 +369,7 @@ void lan966x_fdb_write_entries(struct lan966x *lan966x, u16 vid);
 void lan966x_fdb_erase_entries(struct lan966x *lan966x, u16 vid);
 int lan966x_fdb_init(struct lan966x *lan966x);
 void lan966x_fdb_deinit(struct lan966x *lan966x);
+void lan966x_fdb_flush_workqueue(struct lan966x *lan966x);
 int lan966x_handle_fdb(struct net_device *dev,
 		       struct net_device *orig_dev,
 		       unsigned long event, const void *ctx,
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
index df2bee678559..d9fc6a9a3da1 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
@@ -320,9 +320,10 @@ static int lan966x_port_prechangeupper(struct net_device *dev,
 {
 	struct lan966x_port *port = netdev_priv(dev);
 
-	if (netif_is_bridge_master(info->upper_dev) && !info->linking)
-		switchdev_bridge_port_unoffload(port->dev, port,
-						NULL, NULL);
+	if (netif_is_bridge_master(info->upper_dev) && !info->linking) {
+		switchdev_bridge_port_unoffload(port->dev, port, NULL, NULL);
+		lan966x_fdb_flush_workqueue(port->lan966x);
+	}
 
 	return NOTIFY_DONE;
 }
-- 
2.33.0