netdev - [PATCH net-next 6/6] mlxsw: core: Register devlink instance before sub-objects

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Date:   Mon, 6 Feb 2023 16:39:23 +0100
From:   Petr Machata <petrm@...dia.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, <netdev@...r.kernel.org>
CC:     Jacob Keller <jacob.e.keller@...el.com>,
        Ido Schimmel <idosch@...dia.com>,
        Petr Machata <petrm@...dia.com>, Jiri Pirko <jiri@...dia.com>,
        "Danielle Ratson" <danieller@...dia.com>, <mlxsw@...dia.com>
Subject: [PATCH net-next 6/6] mlxsw: core: Register devlink instance before sub-objects

From: Ido Schimmel <idosch@...dia.com>

Recent changes made it possible to register the devlink instance before
its sub-objects and under the instance lock. Among other things, it
allows us to avoid warnings such as this one [1]. The warning is
generated because a buggy firmware is generating a health event during
driver initialization, before the devlink instance is registered.

Move the registration of the devlink instance to the beginning of the
initialization flow to avoid such problems.

A similar change was implemented in netdevsim in commit 82a3aef2e6af
("netdevsim: move devlink registration under the instance lock").

[1]
WARNING: CPU: 3 PID: 49 at net/devlink/leftover.c:7509 devlink_recover_notify.constprop.0+0xaf/0xc0
[...]
Call Trace:
 <TASK>
 devlink_health_report+0x45/0x1d0
 mlxsw_core_health_event_work+0x24/0x30 [mlxsw_core]
 process_one_work+0x1db/0x390
 worker_thread+0x49/0x3b0
 kthread+0xe5/0x110
 ret_from_fork+0x1f/0x30
 </TASK>

Signed-off-by: Ido Schimmel <idosch@...dia.com>
Reviewed-by: Jiri Pirko <jiri@...dia.com>
Signed-off-by: Petr Machata <petrm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlxsw/core.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
index a08aec243ad6..22db0bb15c45 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
@@ -2184,6 +2184,7 @@ __mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
 			goto err_devlink_alloc;
 		}
 		devl_lock(devlink);
+		devl_register(devlink);
 	}
 
 	mlxsw_core = devlink_priv(devlink);
@@ -2267,10 +2268,8 @@ __mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
 			goto err_driver_init;
 	}
 
-	if (!reload) {
+	if (!reload)
 		devl_unlock(devlink);
-		devlink_register(devlink);
-	}
 	return 0;
 
 err_driver_init:
@@ -2302,6 +2301,7 @@ __mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
 err_bus_init:
 	mlxsw_core_irq_event_handler_fini(mlxsw_core);
 	if (!reload) {
+		devl_unregister(devlink);
 		devl_unlock(devlink);
 		devlink_free(devlink);
 	}
@@ -2340,10 +2340,8 @@ void mlxsw_core_bus_device_unregister(struct mlxsw_core *mlxsw_core,
 {
 	struct devlink *devlink = priv_to_devlink(mlxsw_core);
 
-	if (!reload) {
-		devlink_unregister(devlink);
+	if (!reload)
 		devl_lock(devlink);
-	}
 
 	if (devlink_is_reload_failed(devlink)) {
 		if (!reload)
@@ -2372,6 +2370,7 @@ void mlxsw_core_bus_device_unregister(struct mlxsw_core *mlxsw_core,
 	mlxsw_core->bus->fini(mlxsw_core->bus_priv);
 	mlxsw_core_irq_event_handler_fini(mlxsw_core);
 	if (!reload) {
+		devl_unregister(devlink);
 		devl_unlock(devlink);
 		devlink_free(devlink);
 	}
@@ -2381,6 +2380,7 @@ void mlxsw_core_bus_device_unregister(struct mlxsw_core *mlxsw_core,
 reload_fail_deinit:
 	mlxsw_core_params_unregister(mlxsw_core);
 	devl_resources_unregister(devlink);
+	devl_unregister(devlink);
 	devl_unlock(devlink);
 	devlink_free(devlink);
 }
-- 
2.39.0