change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/net/batman-adv/hard-interface.c
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..
@@ -632,7 +632,19 @@
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  */
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 void batadv_update_min_mtu(struct net_device *soft_iface)
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 {
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-	soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
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+	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
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+	int limit_mtu;
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+	int mtu;
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+
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+	mtu = batadv_hardif_min_mtu(soft_iface);
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+
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+	if (bat_priv->mtu_set_by_user)
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+		limit_mtu = bat_priv->mtu_set_by_user;
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+	else
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+		limit_mtu = ETH_DATA_LEN;
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+
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+	mtu = min(mtu, limit_mtu);
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+	dev_set_mtu(soft_iface, mtu);
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 	/* Check if the local translate table should be cleaned up to match a
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 	 * new (and smaller) MTU.