netdev - Re: [PATCH net] xfrm: add NETDEV_UNREGISTER event process for xfrmi

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Date:   Tue, 27 Aug 2019 08:58:13 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Xin Long <lucien.xin@...il.com>
CC:     network dev <netdev@...r.kernel.org>, <davem@...emloft.net>
Subject: Re: [PATCH net] xfrm: add NETDEV_UNREGISTER event process for xfrmi

On Mon, Aug 26, 2019 at 04:25:05PM +0800, Xin Long wrote:
> When creating a xfrmi dev, it always holds the phydev. The xfrmi dev should
> be deleted when the phydev is being unregistered, so that the phydev can be
> put on time. Otherwise the phydev's deleting will get stuck:
> 
>   # ip link add dummy10 type dummy
>   # ip link add xfrmi10 type xfrm dev dummy10
>   # ip link del dummy10
> 
> The last command blocks and dmesg shows:
> 
>   unregister_netdevice: waiting for dummy10 to become free. Usage count = 1
> 
> This patch fixes it by adding NETDEV_UNREGISTER event process for xfrmi.

There is already a patch in the ipsec tree that fixes this issue
in a different way. Please base xfrm patches on the ipsec/ipsec-next
tree to avoid double work.

Thanks anyway!