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net: core: devlink.c: Hold devlink->lock from the beginning of devlink_dpipe_table_register()

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devlink_dpipe_table_find() should be called under either
rcu_read_lock() or devlink->lock. devlink_dpipe_table_register()
calls devlink_dpipe_table_find() without holding the lock
and acquires it later. Therefore hold the devlink->lock
from the beginning of devlink_dpipe_table_register().

Suggested-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Madhuparna Bhowmik 2020-02-23 16:52:33 +05:30 committed by David S. Miller
parent 503ba7c696
commit 6132c1d903
1 changed files with 14 additions and 7 deletions
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21
net/core/devlink.c
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@ -6878,26 +6878,33 @@ int devlink_dpipe_table_register(struct devlink *devlink,
void *priv, bool counter_control_extern)
{
struct devlink_dpipe_table *table;
if (devlink_dpipe_table_find(&devlink->dpipe_table_list, table_name))
return -EEXIST;
int err = 0;
if (WARN_ON(!table_ops->size_get))
return -EINVAL;
mutex_lock(&devlink->lock);
if (devlink_dpipe_table_find(&devlink->dpipe_table_list, table_name)) {
err = -EEXIST;
goto unlock;
}
table = kzalloc(sizeof(*table), GFP_KERNEL);
if (!table)
return -ENOMEM;
if (!table) {
err = -ENOMEM;
goto unlock;
}
table->name = table_name;
table->table_ops = table_ops;
table->priv = priv;
table->counter_control_extern = counter_control_extern;
mutex_lock(&devlink->lock);
list_add_tail_rcu(&table->list, &devlink->dpipe_table_list);
unlock:
mutex_unlock(&devlink->lock);
return 0;
return err;
}
EXPORT_SYMBOL_GPL(devlink_dpipe_table_register);