Re: [PATCH] IPMI: fix some RCU problems

[Christoph Hellwig <hch@infradead.org>]

> +	if (list_empty(&intf->cmd_rcvrs))
> +		INIT_LIST_HEAD(&list);
> +	else {
> +		list.next = intf->cmd_rcvrs.next;
> +		list.prev = intf->cmd_rcvrs.prev;
> +		INIT_LIST_HEAD(&intf->cmd_rcvrs);
> +
> +		/*
> +		 * At this point the list body still points to
> +		 * intf->cmd_rcvrs.  Wait for any readers to finish
> +		 * using the list before we switch the list body over
> +		 * to the new list.
> +		 */
> +		synchronize_rcu();
> +
> +		/* Ready the list for use. */
> +		list.next->prev = &list;
> +		list.prev->next = &list;
> +	}

This kind of thing must not be opencoded in drivers.  Please add
a new list_splice_rcu helper to list.h

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