Re: [PATCH v2] tipc: ensure head->lock is initialised

[David Miller]

From: Chris Packham <chris.packham@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 12 Jul 2019 10:41:15 +1200

> tipc_named_node_up() creates a skb list. It passes the list to
> tipc_node_xmit() which has some code paths that can call
> skb_queue_purge() which relies on the list->lock being initialised.
> 
> The spin_lock is only needed if the messages end up on the receive path
> but when the list is created in tipc_named_node_up() we don't
> necessarily know if it is going to end up there.
> 
> Once all the skb list users are updated in tipc it will then be possible
> to update them to use the unlocked variants of the skb list functions
> and initialise the lock when we know the message will follow the receive
> path.
> 
> Signed-off-by: Chris Packham <chris.packham@xxxxxxxxxxxxxxxxxxx>

Applied.