devlink: Simplify devlink resources unregister call

The devlink_resources_unregister() used second parameter as an
entry point for the recursive removal of devlink resources. None
of the callers outside of devlink core needed to use this field,
so let's remove it.

As part of this removal, the "struct devlink_resource" was moved
from .h to .c file as it is not possible to use in any place in
the code except devlink.c.

Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/core.c

@@ -160,7 +160,7 @@ static void mlxsw_ports_fini(struct mlxsw_core *mlxsw_core, bool reload)
 
 	devlink_resource_occ_get_unregister(devlink, MLXSW_CORE_RESOURCE_PORTS);
 	if (!reload)
-		devlink_resources_unregister(priv_to_devlink(mlxsw_core), NULL);
+		devlink_resources_unregister(priv_to_devlink(mlxsw_core));
 
 	kfree(mlxsw_core->ports);
 }
@@ -2033,7 +2033,7 @@ __mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
 	mlxsw_ports_fini(mlxsw_core, reload);
 err_ports_init:
 	if (!reload)
-		devlink_resources_unregister(devlink, NULL);
+		devlink_resources_unregister(devlink);
 err_register_resources:
 	mlxsw_bus->fini(bus_priv);
 err_bus_init:
@@ -2099,7 +2099,7 @@ void mlxsw_core_bus_device_unregister(struct mlxsw_core *mlxsw_core,
 	kfree(mlxsw_core->lag.mapping);
 	mlxsw_ports_fini(mlxsw_core, reload);
 	if (!reload)
-		devlink_resources_unregister(devlink, NULL);
+		devlink_resources_unregister(devlink);
 	mlxsw_core->bus->fini(mlxsw_core->bus_priv);
 	if (!reload)
 		devlink_free(devlink);
@@ -2108,7 +2108,7 @@ void mlxsw_core_bus_device_unregister(struct mlxsw_core *mlxsw_core,
 
 reload_fail_deinit:
 	mlxsw_core_params_unregister(mlxsw_core);
-	devlink_resources_unregister(devlink, NULL);
+	devlink_resources_unregister(devlink);
 	devlink_free(devlink);
 }
 EXPORT_SYMBOL(mlxsw_core_bus_device_unregister);

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

@@ -3336,7 +3336,7 @@ static int mlxsw_sp1_resources_register(struct mlxsw_core *mlxsw_core)
 err_policer_resources_register:
 err_resources_counter_register:
 err_resources_span_register:
-	devlink_resources_unregister(priv_to_devlink(mlxsw_core), NULL);
+	devlink_resources_unregister(priv_to_devlink(mlxsw_core));
 	return err;
 }
 
@@ -3370,7 +3370,7 @@ static int mlxsw_sp2_resources_register(struct mlxsw_core *mlxsw_core)
 err_policer_resources_register:
 err_resources_counter_register:
 err_resources_span_register:
-	devlink_resources_unregister(priv_to_devlink(mlxsw_core), NULL);
+	devlink_resources_unregister(priv_to_devlink(mlxsw_core));
 	return err;
 }
 

drivers/net/netdevsim/dev.c

@@ -1622,7 +1622,7 @@ int nsim_drv_probe(struct nsim_bus_dev *nsim_bus_dev)
 	devlink_params_unregister(devlink, nsim_devlink_params,
 				  ARRAY_SIZE(nsim_devlink_params));
 err_dl_unregister:
-	devlink_resources_unregister(devlink, NULL);
+	devlink_resources_unregister(devlink);
 err_vfc_free:
 	kfree(nsim_dev->vfconfigs);
 err_devlink_free:
@@ -1668,7 +1668,7 @@ void nsim_drv_remove(struct nsim_bus_dev *nsim_bus_dev)
 	nsim_dev_debugfs_exit(nsim_dev);
 	devlink_params_unregister(devlink, nsim_devlink_params,
 				  ARRAY_SIZE(nsim_devlink_params));
-	devlink_resources_unregister(devlink, NULL);
+	devlink_resources_unregister(devlink);
 	kfree(nsim_dev->vfconfigs);
 	devlink_free(devlink);
 	dev_set_drvdata(&nsim_bus_dev->dev, NULL);

include/net/devlink.h

@@ -361,33 +361,6 @@ devlink_resource_size_params_init(struct devlink_resource_size_params *size_para
 
 typedef u64 devlink_resource_occ_get_t(void *priv);
 
-/**
- * struct devlink_resource - devlink resource
- * @name: name of the resource
- * @id: id, per devlink instance
- * @size: size of the resource
- * @size_new: updated size of the resource, reload is needed
- * @size_valid: valid in case the total size of the resource is valid
- *              including its children
- * @parent: parent resource
- * @size_params: size parameters
- * @list: parent list
- * @resource_list: list of child resources
- */
-struct devlink_resource {
-	const char *name;
-	u64 id;
-	u64 size;
-	u64 size_new;
-	bool size_valid;
-	struct devlink_resource *parent;
-	struct devlink_resource_size_params size_params;
-	struct list_head list;
-	struct list_head resource_list;
-	devlink_resource_occ_get_t *occ_get;
-	void *occ_get_priv;
-};
-
 #define DEVLINK_RESOURCE_ID_PARENT_TOP 0
 
 #define DEVLINK_RESOURCE_GENERIC_NAME_PORTS "physical_ports"
@@ -1571,8 +1544,7 @@ int devlink_resource_register(struct devlink *devlink,
 			      u64 resource_id,
 			      u64 parent_resource_id,
 			      const struct devlink_resource_size_params *size_params);
-void devlink_resources_unregister(struct devlink *devlink,
-				  struct devlink_resource *resource);
+void devlink_resources_unregister(struct devlink *devlink);
 int devlink_resource_size_get(struct devlink *devlink,
 			      u64 resource_id,
 			      u64 *p_resource_size);

net/core/devlink.c

@@ -69,6 +69,35 @@ struct devlink {
 	char priv[] __aligned(NETDEV_ALIGN);
 };
 
+/**
+ * struct devlink_resource - devlink resource
+ * @name: name of the resource
+ * @id: id, per devlink instance
+ * @size: size of the resource
+ * @size_new: updated size of the resource, reload is needed
+ * @size_valid: valid in case the total size of the resource is valid
+ *              including its children
+ * @parent: parent resource
+ * @size_params: size parameters
+ * @list: parent list
+ * @resource_list: list of child resources
+ * @occ_get: occupancy getter callback
+ * @occ_get_priv: occupancy getter callback priv
+ */
+struct devlink_resource {
+	const char *name;
+	u64 id;
+	u64 size;
+	u64 size_new;
+	bool size_valid;
+	struct devlink_resource *parent;
+	struct devlink_resource_size_params size_params;
+	struct list_head list;
+	struct list_head resource_list;
+	devlink_resource_occ_get_t *occ_get;
+	void *occ_get_priv;
+};
+
 void *devlink_priv(struct devlink *devlink)
 {
 	return &devlink->priv;
@@ -9908,34 +9937,38 @@ int devlink_resource_register(struct devlink *devlink,
 }
 EXPORT_SYMBOL_GPL(devlink_resource_register);
 
+static void devlink_resource_unregister(struct devlink *devlink,
+					struct devlink_resource *resource)
+{
+	struct devlink_resource *tmp, *child_resource;
+
+	list_for_each_entry_safe(child_resource, tmp, &resource->resource_list,
+				 list) {
+		devlink_resource_unregister(devlink, child_resource);
+		list_del(&child_resource->list);
+		kfree(child_resource);
+	}
+}
+
 /**
  *	devlink_resources_unregister - free all resources
  *
  *	@devlink: devlink
- *	@resource: resource
  */
-void devlink_resources_unregister(struct devlink *devlink,
-				  struct devlink_resource *resource)
+void devlink_resources_unregister(struct devlink *devlink)
 {
 	struct devlink_resource *tmp, *child_resource;
-	struct list_head *resource_list;
-
-	if (resource)
-		resource_list = &resource->resource_list;
-	else
-		resource_list = &devlink->resource_list;
 
-	if (!resource)
-		mutex_lock(&devlink->lock);
+	mutex_lock(&devlink->lock);
 
-	list_for_each_entry_safe(child_resource, tmp, resource_list, list) {
-		devlink_resources_unregister(devlink, child_resource);
+	list_for_each_entry_safe(child_resource, tmp, &devlink->resource_list,
+				 list) {
+		devlink_resource_unregister(devlink, child_resource);
 		list_del(&child_resource->list);
 		kfree(child_resource);
 	}
 
-	if (!resource)
-		mutex_unlock(&devlink->lock);
+	mutex_unlock(&devlink->lock);
 }
 EXPORT_SYMBOL_GPL(devlink_resources_unregister);
 

net/dsa/dsa.c

@@ -406,7 +406,7 @@ EXPORT_SYMBOL_GPL(dsa_devlink_resource_register);
 
 void dsa_devlink_resources_unregister(struct dsa_switch *ds)
 {
-	devlink_resources_unregister(ds->devlink, NULL);
+	devlink_resources_unregister(ds->devlink);
 }
 EXPORT_SYMBOL_GPL(dsa_devlink_resources_unregister);