add driver 5G

hc

2024-01-31 f9004dbfff8a3fbbd7e2a88c8a4327c7f2f8e5b2

 kernel/include/net/ax25.h
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@@ -236,6 +236,7 @@
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 #if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
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 	ax25_dama_info		dama;
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 #endif
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+	refcount_t		refcount;
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 } ax25_dev;
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 typedef struct ax25_cb {
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@@ -290,6 +291,17 @@
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 	}
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 }
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+static inline void ax25_dev_hold(ax25_dev *ax25_dev)
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+{
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+	refcount_inc(&ax25_dev->refcount);
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+}
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+
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+static inline void ax25_dev_put(ax25_dev *ax25_dev)
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+{
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+	if (refcount_dec_and_test(&ax25_dev->refcount)) {
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+		kfree(ax25_dev);
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+	}
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+}
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 static inline __be16 ax25_type_trans(struct sk_buff *skb, struct net_device *dev)
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 {
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 	skb->dev      = dev;