add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/net/wan/hdlc.c
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@@ -1,11 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Generic HDLC support routines for Linux
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  *
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  * Copyright (C) 1999 - 2008 Krzysztof Halasa <khc@pm.waw.pl>
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of version 2 of the GNU General Public License
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- * as published by the Free Software Foundation.
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  *
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  * Currently supported:
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  *	* raw IP-in-HDLC
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@@ -240,7 +237,8 @@
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 	dev->min_mtu		 = 68;
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 	dev->max_mtu		 = HDLC_MAX_MTU;
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 	dev->type		 = ARPHRD_RAWHDLC;
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-	dev->hard_header_len	 = 16;
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+	dev->hard_header_len	 = 0;
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+	dev->needed_headroom	 = 0;
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 	dev->addr_len		 = 0;
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 	dev->header_ops		 = &hdlc_null_ops;
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 }