add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/net/ieee802154/mac802154_hwsim.c
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@@ -522,7 +522,7 @@
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 static int hwsim_set_edge_lqi(struct sk_buff *msg, struct genl_info *info)
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 {
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 	struct nlattr *edge_attrs[MAC802154_HWSIM_EDGE_ATTR_MAX + 1];
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-	struct hwsim_edge_info *einfo;
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+	struct hwsim_edge_info *einfo, *einfo_old;
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 	struct hwsim_phy *phy_v0;
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 	struct hwsim_edge *e;
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 	u32 v0, v1;
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@@ -560,8 +560,10 @@
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 	list_for_each_entry_rcu(e, &phy_v0->edges, list) {
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 		if (e->endpoint->idx == v1) {
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 			einfo->lqi = lqi;
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-			rcu_assign_pointer(e->info, einfo);
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+			einfo_old = rcu_replace_pointer(e->info, einfo,
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+							lockdep_is_held(&hwsim_phys_lock));
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 			rcu_read_unlock();
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+			kfree_rcu(einfo_old, rcu);
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 			mutex_unlock(&hwsim_phys_lock);
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 			return 0;
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 		}