Revert "devlink: Remove not-executed trap policer notifications"

This reverts commit 22849b5 as it
revealed that mlxsw and netdevsim (copy/paste from mlxsw) reregisters
devlink objects during another devlink user triggered command.

Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/core/devlink.c

@@ -11180,7 +11180,8 @@ devlink_trap_policer_notify(struct devlink *devlink,
 
 	WARN_ON_ONCE(cmd != DEVLINK_CMD_TRAP_POLICER_NEW &&
 		     cmd != DEVLINK_CMD_TRAP_POLICER_DEL);
-	ASSERT_DEVLINK_REGISTERED(devlink);
+	if (!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED))
+		return;
 
 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg)
@@ -11222,6 +11223,9 @@ devlink_trap_policer_register(struct devlink *devlink,
 	}
 
 	list_add_tail(&policer_item->list, &devlink->trap_policer_list);
+	devlink_trap_policer_notify(devlink, policer_item,
+				    DEVLINK_CMD_TRAP_POLICER_NEW);
+
 	return 0;
 
 err_policer_init:
@@ -11239,6 +11243,8 @@ devlink_trap_policer_unregister(struct devlink *devlink,
 	if (WARN_ON_ONCE(!policer_item))
 		return;
 
+	devlink_trap_policer_notify(devlink, policer_item,
+				    DEVLINK_CMD_TRAP_POLICER_DEL);
 	list_del(&policer_item->list);
 	if (devlink->ops->trap_policer_fini)
 		devlink->ops->trap_policer_fini(devlink, policer);
@@ -11260,8 +11266,6 @@ devlink_trap_policers_register(struct devlink *devlink,
 {
 	int i, err;
 
-	ASSERT_DEVLINK_NOT_REGISTERED(devlink);
-
 	mutex_lock(&devlink->lock);
 	for (i = 0; i < policers_count; i++) {
 		const struct devlink_trap_policer *policer = &policers[i];
@@ -11303,8 +11307,6 @@ devlink_trap_policers_unregister(struct devlink *devlink,
 {
 	int i;
 
-	ASSERT_DEVLINK_NOT_REGISTERED(devlink);
-
 	mutex_lock(&devlink->lock);
 	for (i = policers_count - 1; i >= 0; i--)
 		devlink_trap_policer_unregister(devlink, &policers[i]);