From 2eb51c75dcb354f8aef03d7648318b24630632e1 Mon Sep 17 00:00:00 2001 From: Madhuparna Bhowmik Date: Tue, 25 Feb 2020 17:57:45 +0530 Subject: net: core: devlink.c: Use built-in RCU list checking list_for_each_entry_rcu() has built-in RCU and lock checking. Pass cond argument to list_for_each_entry_rcu() to silence false lockdep warning when CONFIG_PROVE_RCU_LIST is enabled. The devlink->lock is held when devlink_dpipe_table_find() is called in non RCU read side section. Therefore, pass struct devlink to devlink_dpipe_table_find() for lockdep checking. Signed-off-by: Madhuparna Bhowmik Reviewed-by: Jiri Pirko Signed-off-by: David S. Miller --- net/core/devlink.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) (limited to 'net') diff --git a/net/core/devlink.c b/net/core/devlink.c index 8d0b558be942..5e220809844c 100644 --- a/net/core/devlink.c +++ b/net/core/devlink.c @@ -2103,11 +2103,11 @@ err_action_values_put: static struct devlink_dpipe_table * devlink_dpipe_table_find(struct list_head *dpipe_tables, - const char *table_name) + const char *table_name, struct devlink *devlink) { struct devlink_dpipe_table *table; - - list_for_each_entry_rcu(table, dpipe_tables, list) { + list_for_each_entry_rcu(table, dpipe_tables, list, + lockdep_is_held(&devlink->lock)) { if (!strcmp(table->name, table_name)) return table; } @@ -2226,7 +2226,7 @@ static int devlink_nl_cmd_dpipe_entries_get(struct sk_buff *skb, table_name = nla_data(info->attrs[DEVLINK_ATTR_DPIPE_TABLE_NAME]); table = devlink_dpipe_table_find(&devlink->dpipe_table_list, - table_name); + table_name, devlink); if (!table) return -EINVAL; @@ -2382,7 +2382,7 @@ static int devlink_dpipe_table_counters_set(struct devlink *devlink, struct devlink_dpipe_table *table; table = devlink_dpipe_table_find(&devlink->dpipe_table_list, - table_name); + table_name, devlink); if (!table) return -EINVAL; @@ -6854,7 +6854,7 @@ bool devlink_dpipe_table_counter_enabled(struct devlink *devlink, rcu_read_lock(); table = devlink_dpipe_table_find(&devlink->dpipe_table_list, - table_name); + table_name, devlink); enabled = false; if (table) enabled = table->counters_enabled; @@ -6885,7 +6885,8 @@ int devlink_dpipe_table_register(struct devlink *devlink, mutex_lock(&devlink->lock); - if (devlink_dpipe_table_find(&devlink->dpipe_table_list, table_name)) { + if (devlink_dpipe_table_find(&devlink->dpipe_table_list, table_name, + devlink)) { err = -EEXIST; goto unlock; } @@ -6921,7 +6922,7 @@ void devlink_dpipe_table_unregister(struct devlink *devlink, mutex_lock(&devlink->lock); table = devlink_dpipe_table_find(&devlink->dpipe_table_list, - table_name); + table_name, devlink); if (!table) goto unlock; list_del_rcu(&table->list); @@ -7078,7 +7079,7 @@ int devlink_dpipe_table_resource_set(struct devlink *devlink, mutex_lock(&devlink->lock); table = devlink_dpipe_table_find(&devlink->dpipe_table_list, - table_name); + table_name, devlink); if (!table) { err = -EINVAL; goto out; -- cgit v1.2.3-59-g8ed1b