[PATCH net-next 9/9] netdevsim: move devlink registration under the instance lock

[Jakub Kicinski <kuba@kernel.org>]

To prevent races with netdev code accessing free devlink instances
move the registration under the devlink instance lock.
Core now waits for the instance to be registered before accessing it.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/net/netdevsim/dev.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index d25f6e86d901..738784fda117 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -1556,10 +1556,14 @@ int nsim_drv_probe(struct nsim_bus_dev *nsim_bus_dev)
 		goto err_devlink_unlock;
 	}
 
-	err = nsim_dev_resources_register(devlink);
+	err = devl_register(devlink);
 	if (err)
 		goto err_vfc_free;
 
+	err = nsim_dev_resources_register(devlink);
+	if (err)
+		goto err_dl_unregister;
+
 	err = devlink_params_register(devlink, nsim_devlink_params,
 				      ARRAY_SIZE(nsim_devlink_params));
 	if (err)
@@ -1607,7 +1611,6 @@ int nsim_drv_probe(struct nsim_bus_dev *nsim_bus_dev)
 	nsim_dev->esw_mode = DEVLINK_ESWITCH_MODE_LEGACY;
 	devlink_set_features(devlink, DEVLINK_F_RELOAD);
 	devl_unlock(devlink);
-	devlink_register(devlink);
 	return 0;
 
 err_hwstats_exit:
@@ -1631,6 +1634,8 @@ int nsim_drv_probe(struct nsim_bus_dev *nsim_bus_dev)
 				  ARRAY_SIZE(nsim_devlink_params));
 err_resource_unregister:
 	devl_resources_unregister(devlink);
+err_dl_unregister:
+	devl_unregister(devlink);
 err_vfc_free:
 	kfree(nsim_dev->vfconfigs);
 err_devlink_unlock:
@@ -1668,7 +1673,6 @@ void nsim_drv_remove(struct nsim_bus_dev *nsim_bus_dev)
 	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
 	struct devlink *devlink = priv_to_devlink(nsim_dev);
 
-	devlink_unregister(devlink);
 	devl_lock(devlink);
 	nsim_dev_reload_destroy(nsim_dev);
 
@@ -1677,6 +1681,7 @@ void nsim_drv_remove(struct nsim_bus_dev *nsim_bus_dev)
 	devlink_params_unregister(devlink, nsim_devlink_params,
 				  ARRAY_SIZE(nsim_devlink_params));
 	devl_resources_unregister(devlink);
+	devl_unregister(devlink);
 	kfree(nsim_dev->vfconfigs);
 	kfree(nsim_dev->fa_cookie);
 	devl_unlock(devlink);
-- 
2.38.1