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Date:   Fri, 28 Aug 2020 00:07:52 -0700
From:   Xie He <>
To:     "David S. Miller" <>,
        Jakub Kicinski <>,
        Krzysztof Halasa <>,,
Cc:     Xie He <>, Martin Schiller <>
Subject: [PATCH net] drivers/net/wan/hdlc_cisco: Add hard_header_len

This driver didn't set hard_header_len. This patch sets hard_header_len
for it according to its header_ops->create function.

This driver's header_ops->create function (cisco_hard_header) creates
a header of (struct hdlc_header), so hard_header_len should be set to
sizeof(struct hdlc_header).

Cc: Martin Schiller <>
Signed-off-by: Xie He <>
 drivers/net/wan/hdlc_cisco.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wan/hdlc_cisco.c b/drivers/net/wan/hdlc_cisco.c
index d8cba3625c18..444130655d8e 100644
--- a/drivers/net/wan/hdlc_cisco.c
+++ b/drivers/net/wan/hdlc_cisco.c
@@ -370,6 +370,7 @@ static int cisco_ioctl(struct net_device *dev, struct ifreq *ifr)
 		memcpy(&state(hdlc)->settings, &new_settings, size);
 		dev->header_ops = &cisco_header_ops;
+		dev->hard_header_len = sizeof(struct hdlc_header);
 		dev->type = ARPHRD_CISCO;
 		call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);

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