[PATCH net-next v3 2/3] net: pse-pd: fire lifecycle events on controller register/unregister

[Carlo Szelinsky <github@szelinsky.de>]

From: Corey Leavitt <corey@leavitt.info>

Hook the newly-introduced pse_controller_notifier chain so that
pse_controller_register() fires PSE_REGISTERED after the controller
has been added to pse_controller_list (i.e. is now resolvable by
of_pse_control_get()), and pse_controller_unregister() fires
PSE_UNREGISTERED before the controller is removed from the list
(while it is still valid to dereference from a subscriber's
pse_control pointer targeting it).

With no subscribers yet, this is observably a no-op. A later change
wires the phy subsystem in as the first subscriber.

Signed-off-by: Corey Leavitt <corey@leavitt.info>
Signed-off-by: Carlo Szelinsky <github@szelinsky.de>
---
 drivers/net/pse-pd/pse_core.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/pse-pd/pse_core.c b/drivers/net/pse-pd/pse_core.c
index 3c4d09f1d6e4..0190fac33c78 100644
--- a/drivers/net/pse-pd/pse_core.c
+++ b/drivers/net/pse-pd/pse_core.c
@@ -1138,6 +1138,9 @@ int pse_controller_register(struct pse_controller_dev *pcdev)
 	list_add(&pcdev->list, &pse_controller_list);
 	mutex_unlock(&pse_list_mutex);
 
+	blocking_notifier_call_chain(&pse_controller_notifier,
+				     PSE_REGISTERED, pcdev);
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(pse_controller_register);
@@ -1148,6 +1151,9 @@ EXPORT_SYMBOL_GPL(pse_controller_register);
  */
 void pse_controller_unregister(struct pse_controller_dev *pcdev)
 {
+	blocking_notifier_call_chain(&pse_controller_notifier,
+				     PSE_UNREGISTERED, pcdev);
+
 	pse_flush_pw_ds(pcdev);
 	pse_release_pis(pcdev);
 	if (pcdev->irq)
-- 
2.43.0