netdev - Re: [PATCH] macvlan: fix oops with vlan-on-top and HW_VLAN_CTAG

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Message-ID: <20140103113904.GB28854@breakpoint.cc>
Date:	Fri, 3 Jan 2014 12:39:04 +0100
From:	Florian Westphal <fw@...len.de>
To:	David Miller <davem@...emloft.net>
Cc:	fw@...len.de, netdev@...r.kernel.org
Subject: Re: [PATCH] macvlan: fix oops with vlan-on-top and HW_VLAN_CTAG_TX
 lowerdev

David Miller <davem@...emloft.net> wrote:
> vlan: Fix header ops passthru when doing TX VLAN offload.
> 
> When the vlan code detects that the real device can do TX VLAN offloads
> in hardware, it tries to arrange for the real device's header_ops to
> be invoked directly.

Sorry for the late reply.

> +static inline int dev_rebuild_header(struct sk_buff *skb)
> +{
> +	const struct net_device *dev = skb->dev;
> +
> +	if (!dev->header_ops || !dev->header_ops->rebuild)
> +		return 0;
> +	return dev->header_ops->rebuild(skb);
> +}
> +
[..]

> +static const struct header_ops vlan_passthru_header_ops = {
> +	.create	 = vlan_passthru_hard_header,
> +	.rebuild = dev_rebuild_header,

Doesn't that result in infinite recursion when invoking
dev_rebuild_header() on skb whose dev->header_ops is
vlan_passthru_header_ops?
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