devlink: allow registering parameters after the instance

It's most natural to register the instance first and then its
subobjects. Now that we can use the instance lock to protect
the atomicity of all init - it should also be safe.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/devlink/leftover.c b/net/devlink/leftover.c
index 491f821c8b778a61167e1a839945c7aacf923824..1e23b2da78cc9d4033a4d584e70ca53e7eec9442 100644 (file)
--- a/net/devlink/leftover.c
+++ b/net/devlink/leftover.c
@@ -5263,7 +5263,13 @@ static void devlink_param_notify(struct devlink *devlink,
        WARN_ON(cmd != DEVLINK_CMD_PARAM_NEW && cmd != DEVLINK_CMD_PARAM_DEL &&
                cmd != DEVLINK_CMD_PORT_PARAM_NEW &&
                cmd != DEVLINK_CMD_PORT_PARAM_DEL);
-       ASSERT_DEVLINK_REGISTERED(devlink);
+
+       /* devlink_notify_register() / devlink_notify_unregister()
+        * will replay the notifications if the params are added/removed
+        * outside of the lifetime of the instance.
+        */
+       if (!devl_is_registered(devlink))
+               return;
 
        msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
        if (!msg)
@@ -10915,8 +10921,6 @@ int devlink_params_register(struct devlink *devlink,
        const struct devlink_param *param = params;
        int i, err;
 
-       ASSERT_DEVLINK_NOT_REGISTERED(devlink);
-
        for (i = 0; i < params_count; i++, param++) {
                err = devlink_param_register(devlink, param);
                if (err)
@@ -10947,8 +10951,6 @@ void devlink_params_unregister(struct devlink *devlink,
        const struct devlink_param *param = params;
        int i;
 
-       ASSERT_DEVLINK_NOT_REGISTERED(devlink);
-
        for (i = 0; i < params_count; i++, param++)
                devlink_param_unregister(devlink, param);
 }
@@ -10968,8 +10970,6 @@ int devlink_param_register(struct devlink *devlink,
 {
        struct devlink_param_item *param_item;
 
-       ASSERT_DEVLINK_NOT_REGISTERED(devlink);
-
        WARN_ON(devlink_param_verify(param));
        WARN_ON(devlink_param_find_by_name(&devlink->param_list, param->name));
 
@@ -10985,6 +10985,7 @@ int devlink_param_register(struct devlink *devlink,
        param_item->param = param;
 
        list_add_tail(&param_item->list, &devlink->param_list);
+       devlink_param_notify(devlink, 0, param_item, DEVLINK_CMD_PARAM_NEW);
        return 0;
 }
 EXPORT_SYMBOL_GPL(devlink_param_register);
@@ -10999,11 +11000,10 @@ void devlink_param_unregister(struct devlink *devlink,
 {
        struct devlink_param_item *param_item;
 
-       ASSERT_DEVLINK_NOT_REGISTERED(devlink);
-
        param_item =
                devlink_param_find_by_name(&devlink->param_list, param->name);
        WARN_ON(!param_item);
+       devlink_param_notify(devlink, 0, param_item, DEVLINK_CMD_PARAM_DEL);
        list_del(&param_item->list);
        kfree(param_item);
 }
@@ -11063,8 +11063,6 @@ int devlink_param_driverinit_value_set(struct devlink *devlink, u32 param_id,
 {
        struct devlink_param_item *param_item;
 
-       ASSERT_DEVLINK_NOT_REGISTERED(devlink);
-
        param_item = devlink_param_find_by_id(&devlink->param_list, param_id);
        if (!param_item)
                return -EINVAL;
@@ -11078,6 +11076,8 @@ int devlink_param_driverinit_value_set(struct devlink *devlink, u32 param_id,
        else
                param_item->driverinit_value = init_val;
        param_item->driverinit_value_valid = true;
+
+       devlink_param_notify(devlink, 0, param_item, DEVLINK_CMD_PARAM_NEW);
        return 0;
 }
 EXPORT_SYMBOL_GPL(devlink_param_driverinit_value_set);