netdev - [PATCH net-next 4/9] net: marvell: prestera: add delayed wq and flush wq on deinit

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Date:   Sun, 10 Jul 2022 20:22:02 +0300
From:   Yevhen Orlov <yevhen.orlov@...ision.eu>
To:     netdev@...r.kernel.org
Cc:     Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>,
        Taras Chornyi <taras.chornyi@...ision.eu>,
        Mickey Rachamim <mickeyr@...vell.com>,
        Serhiy Pshyk <serhiy.pshyk@...ision.eu>,
        Yevhen Orlov <yevhen.orlov@...ision.eu>,
        Taras Chornyi <tchornyi@...vell.com>,
        Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 4/9] net: marvell: prestera: add delayed wq and flush wq on deinit

Flushing workqueues ensures, that no more pending works, related to just
unregistered or deinitialized notifiers. After that we can free memory.

Delayed wq will be used for neighbours in next patches.

Co-developed-by: Taras Chornyi <tchornyi@...vell.com>
Signed-off-by: Taras Chornyi <tchornyi@...vell.com>
Co-developed-by: Oleksandr Mazur <oleksandr.mazur@...ision.eu>
Signed-off-by: Oleksandr Mazur <oleksandr.mazur@...ision.eu>
Signed-off-by: Yevhen Orlov <yevhen.orlov@...ision.eu>
---
 drivers/net/ethernet/marvell/prestera/prestera.h      |  2 ++
 drivers/net/ethernet/marvell/prestera/prestera_main.c | 11 +++++++++++
 .../net/ethernet/marvell/prestera/prestera_router.c   |  1 +
 3 files changed, 14 insertions(+)

diff --git a/drivers/net/ethernet/marvell/prestera/prestera.h b/drivers/net/ethernet/marvell/prestera/prestera.h
index 7edb51f1aa45..e53e5826e620 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera.h
+++ b/drivers/net/ethernet/marvell/prestera/prestera.h
@@ -335,6 +335,8 @@ int prestera_port_cfg_mac_write(struct prestera_port *port,
 struct prestera_port *prestera_port_dev_lower_find(struct net_device *dev);
 
 void prestera_queue_work(struct work_struct *work);
+void prestera_queue_delayed_work(struct delayed_work *work, unsigned long delay);
+void prestera_queue_drain(void);
 
 int prestera_port_pvid_set(struct prestera_port *port, u16 vid);
 
diff --git a/drivers/net/ethernet/marvell/prestera/prestera_main.c b/drivers/net/ethernet/marvell/prestera/prestera_main.c
index 3952fdcc9240..e76548e194a0 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_main.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_main.c
@@ -35,6 +35,17 @@ void prestera_queue_work(struct work_struct *work)
 	queue_work(prestera_owq, work);
 }
 
+void prestera_queue_delayed_work(struct delayed_work *work, unsigned long delay)
+{
+	queue_delayed_work(prestera_wq, work, delay);
+}
+
+void prestera_queue_drain(void)
+{
+	drain_workqueue(prestera_wq);
+	drain_workqueue(prestera_owq);
+}
+
 int prestera_port_pvid_set(struct prestera_port *port, u16 vid)
 {
 	enum prestera_accept_frm_type frm_type;
diff --git a/drivers/net/ethernet/marvell/prestera/prestera_router.c b/drivers/net/ethernet/marvell/prestera/prestera_router.c
index 41955c7f8323..db327ab4a072 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_router.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_router.c
@@ -643,6 +643,7 @@ void prestera_router_fini(struct prestera_switch *sw)
 	unregister_fib_notifier(&init_net, &sw->router->fib_nb);
 	unregister_inetaddr_notifier(&sw->router->inetaddr_nb);
 	unregister_inetaddr_validator_notifier(&sw->router->inetaddr_valid_nb);
+	prestera_queue_drain();
 
 	prestera_k_arb_abort(sw);
 
-- 
2.17.1