devlink rate: Remove unnecessary 'static' from a couple places

devlink_rate_node_get_by_name() and devlink_rate_nodes_destroy() have a
couple of unnecessary static variables for iterating over devlink rates.

This could lead to races/corruption/unhappiness if two concurrent
operations execute the same function.

Remove 'static' from both. It's amazing this was missed for 4+ years.
While at it, I confirmed there are no more examples of this mistake in
net/ with 1, 2 or 3 levels of indentation.

Fixes: a8ecb93 ("devlink: Introduce rate nodes")
Signed-off-by: Cosmin Ratiu <[email protected]>
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Cosmin Ratiu

net/devlink/rate.c

@@ -34,7 +34,7 @@ devlink_rate_leaf_get_from_info(struct devlink *devlink, struct genl_info *info)
 static struct devlink_rate *
 devlink_rate_node_get_by_name(struct devlink *devlink, const char *node_name)
 {
-	static struct devlink_rate *devlink_rate;
+	struct devlink_rate *devlink_rate;
 
 	list_for_each_entry(devlink_rate, &devlink->rate_list, list) {
 		if (devlink_rate_is_node(devlink_rate) &&
@@ -819,8 +819,8 @@ EXPORT_SYMBOL_GPL(devl_rate_leaf_destroy);
  */
 void devl_rate_nodes_destroy(struct devlink *devlink)
 {
-	static struct devlink_rate *devlink_rate, *tmp;
 	const struct devlink_ops *ops = devlink->ops;
+	struct devlink_rate *devlink_rate, *tmp;
 
 	devl_assert_locked(devlink);