devlink: remove reporters_lock

Similar to other devlink objects, rely on devlink instance lock
and remove object specific reporters_lock.
Signed-off-by: NJiri Pirko <jiri@nvidia.com>
Reviewed-by: NJacob Keller <jacob.e.keller@intel.com>
Signed-off-by: NJakub Kicinski <kuba@kernel.org>

include/net/devlink.h

@@ -146,7 +146,6 @@ struct devlink_port {
 	   initialized:1;
 	struct delayed_work type_warn_dw;
 	struct list_head reporter_list;
-	struct mutex reporters_lock; /* Protects reporter_list */
 
 	struct devlink_rate *devlink_rate;
 	struct devlink_linecard *linecard;

net/devlink/core.c

@@ -246,7 +246,6 @@ struct devlink *devlink_alloc_ns(const struct devlink_ops *ops,
 	lockdep_register_key(&devlink->lock_key);
 	mutex_init(&devlink->lock);
 	lockdep_set_class(&devlink->lock, &devlink->lock_key);
-	mutex_init(&devlink->reporters_lock);
 	refcount_set(&devlink->refcount, 1);
 
 	return devlink;
@@ -268,7 +267,6 @@ void devlink_free(struct devlink *devlink)
 {
 	ASSERT_DEVLINK_NOT_REGISTERED(devlink);
 
-	mutex_destroy(&devlink->reporters_lock);
 	WARN_ON(!list_empty(&devlink->trap_policer_list));
 	WARN_ON(!list_empty(&devlink->trap_group_list));
 	WARN_ON(!list_empty(&devlink->trap_list));

net/devlink/devl_internal.h

@@ -32,7 +32,6 @@ struct devlink {
 	struct list_head param_list;
 	struct list_head region_list;
 	struct list_head reporter_list;
-	struct mutex reporters_lock; /* protects reporter_list */
 	struct devlink_dpipe_headers *dpipe_headers;
 	struct list_head trap_list;
 	struct list_head trap_group_list;

net/devlink/leftover.c

@@ -7281,12 +7281,10 @@ EXPORT_SYMBOL_GPL(devlink_health_reporter_priv);
 
 static struct devlink_health_reporter *
 __devlink_health_reporter_find_by_name(struct list_head *reporter_list,
-				       struct mutex *list_lock,
 				       const char *reporter_name)
 {
 	struct devlink_health_reporter *reporter;
 
-	lockdep_assert_held(list_lock);
 	list_for_each_entry(reporter, reporter_list, list)
 		if (!strcmp(reporter->ops->name, reporter_name))
 			return reporter;
@@ -7298,7 +7296,6 @@ devlink_health_reporter_find_by_name(struct devlink *devlink,
 				     const char *reporter_name)
 {
 	return __devlink_health_reporter_find_by_name(&devlink->reporter_list,
-						      &devlink->reporters_lock,
 						      reporter_name);
 }
 
@@ -7307,7 +7304,6 @@ devlink_port_health_reporter_find_by_name(struct devlink_port *devlink_port,
 					  const char *reporter_name)
 {
 	return __devlink_health_reporter_find_by_name(&devlink_port->reporter_list,
-						      &devlink_port->reporters_lock,
 						      reporter_name);
 }
 
@@ -7353,22 +7349,18 @@ devl_port_health_reporter_create(struct devlink_port *port,
 	struct devlink_health_reporter *reporter;
 
 	devl_assert_locked(port->devlink);
-	mutex_lock(&port->reporters_lock);
+
 	if (__devlink_health_reporter_find_by_name(&port->reporter_list,
-						   &port->reporters_lock, ops->name)) {
-		reporter = ERR_PTR(-EEXIST);
-		goto unlock;
-	}
+						   ops->name))
+		return ERR_PTR(-EEXIST);
 
 	reporter = __devlink_health_reporter_create(port->devlink, ops,
 						    graceful_period, priv);
 	if (IS_ERR(reporter))
-		goto unlock;
+		return reporter;
 
 	reporter->devlink_port = port;
 	list_add_tail(&reporter->list, &port->reporter_list);
-unlock:
-	mutex_unlock(&port->reporters_lock);
 	return reporter;
 }
 EXPORT_SYMBOL_GPL(devl_port_health_reporter_create);
@@ -7405,20 +7397,16 @@ devl_health_reporter_create(struct devlink *devlink,
 	struct devlink_health_reporter *reporter;
 
 	devl_assert_locked(devlink);
-	mutex_lock(&devlink->reporters_lock);
-	if (devlink_health_reporter_find_by_name(devlink, ops->name)) {
-		reporter = ERR_PTR(-EEXIST);
-		goto unlock;
-	}
+
+	if (devlink_health_reporter_find_by_name(devlink, ops->name))
+		return ERR_PTR(-EEXIST);
 
 	reporter = __devlink_health_reporter_create(devlink, ops,
 						    graceful_period, priv);
 	if (IS_ERR(reporter))
-		goto unlock;
+		return reporter;
 
 	list_add_tail(&reporter->list, &devlink->reporter_list);
-unlock:
-	mutex_unlock(&devlink->reporters_lock);
 	return reporter;
 }
 EXPORT_SYMBOL_GPL(devl_health_reporter_create);
@@ -7469,13 +7457,9 @@ __devlink_health_reporter_destroy(struct devlink_health_reporter *reporter)
 void
 devl_health_reporter_destroy(struct devlink_health_reporter *reporter)
 {
-	struct mutex *lock = &reporter->devlink->reporters_lock;
-
 	devl_assert_locked(reporter->devlink);
 
-	mutex_lock(lock);
 	__devlink_health_reporter_destroy(reporter);
-	mutex_unlock(lock);
 }
 EXPORT_SYMBOL_GPL(devl_health_reporter_destroy);
 
@@ -7498,13 +7482,9 @@ EXPORT_SYMBOL_GPL(devlink_health_reporter_destroy);
 void
 devl_port_health_reporter_destroy(struct devlink_health_reporter *reporter)
 {
-	struct mutex *lock = &reporter->devlink_port->reporters_lock;
-
 	devl_assert_locked(reporter->devlink);
 
-	mutex_lock(lock);
 	__devlink_health_reporter_destroy(reporter);
-	mutex_unlock(lock);
 }
 EXPORT_SYMBOL_GPL(devl_port_health_reporter_destroy);
 
@@ -7758,17 +7738,13 @@ devlink_health_reporter_get_from_attrs(struct devlink *devlink,
 	reporter_name = nla_data(attrs[DEVLINK_ATTR_HEALTH_REPORTER_NAME]);
 	devlink_port = devlink_port_get_from_attrs(devlink, attrs);
 	if (IS_ERR(devlink_port)) {
-		mutex_lock(&devlink->reporters_lock);
 		reporter = devlink_health_reporter_find_by_name(devlink, reporter_name);
 		if (reporter)
 			refcount_inc(&reporter->refcount);
-		mutex_unlock(&devlink->reporters_lock);
 	} else {
-		mutex_lock(&devlink_port->reporters_lock);
 		reporter = devlink_port_health_reporter_find_by_name(devlink_port, reporter_name);
 		if (reporter)
 			refcount_inc(&reporter->refcount);
-		mutex_unlock(&devlink_port->reporters_lock);
 	}
 
 	return reporter;
@@ -7868,8 +7844,6 @@ devlink_nl_cmd_health_reporter_get_dumpit(struct sk_buff *msg,
 		if (!devl_is_registered(devlink))
 			goto next_devlink;
 
-		mutex_lock(&devlink->reporters_lock);
-
 		list_for_each_entry(reporter, &devlink->reporter_list,
 				    list) {
 			if (idx < state->idx) {
@@ -7881,7 +7855,6 @@ devlink_nl_cmd_health_reporter_get_dumpit(struct sk_buff *msg,
 				NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 				NLM_F_MULTI);
 			if (err) {
-				mutex_unlock(&devlink->reporters_lock);
 				devl_unlock(devlink);
 				devlink_put(devlink);
 				state->idx = idx;
@@ -7889,10 +7862,8 @@ devlink_nl_cmd_health_reporter_get_dumpit(struct sk_buff *msg,
 			}
 			idx++;
 		}
-		mutex_unlock(&devlink->reporters_lock);
 
 		xa_for_each(&devlink->ports, port_index, port) {
-			mutex_lock(&port->reporters_lock);
 			list_for_each_entry(reporter, &port->reporter_list, list) {
 				if (idx < state->idx) {
 					idx++;
@@ -7904,7 +7875,6 @@ devlink_nl_cmd_health_reporter_get_dumpit(struct sk_buff *msg,
 					NETLINK_CB(cb->skb).portid,
 					cb->nlh->nlmsg_seq, NLM_F_MULTI);
 				if (err) {
-					mutex_unlock(&port->reporters_lock);
 					devl_unlock(devlink);
 					devlink_put(devlink);
 					state->idx = idx;
@@ -7912,7 +7882,6 @@ devlink_nl_cmd_health_reporter_get_dumpit(struct sk_buff *msg,
 				}
 				idx++;
 			}
-			mutex_unlock(&port->reporters_lock);
 		}
 next_devlink:
 		devl_unlock(devlink);
@@ -9633,12 +9602,9 @@ int devl_port_register(struct devlink *devlink,
 	devlink_port->index = port_index;
 	spin_lock_init(&devlink_port->type_lock);
 	INIT_LIST_HEAD(&devlink_port->reporter_list);
-	mutex_init(&devlink_port->reporters_lock);
 	err = xa_insert(&devlink->ports, port_index, devlink_port, GFP_KERNEL);
-	if (err) {
-		mutex_destroy(&devlink_port->reporters_lock);
+	if (err)
 		return err;
-	}
 
 	INIT_DELAYED_WORK(&devlink_port->type_warn_dw, &devlink_port_type_warn);
 	devlink_port_type_warn_schedule(devlink_port);
@@ -9689,7 +9655,6 @@ void devl_port_unregister(struct devlink_port *devlink_port)
 	devlink_port_notify(devlink_port, DEVLINK_CMD_PORT_DEL);
 	xa_erase(&devlink_port->devlink->ports, devlink_port->index);
 	WARN_ON(!list_empty(&devlink_port->reporter_list));
-	mutex_destroy(&devlink_port->reporters_lock);
 	devlink_port->registered = false;
 }
 EXPORT_SYMBOL_GPL(devl_port_unregister);