On Thu, Sep 29, 2005 at 04:30:28PM -0700, Suzanne Wood wrote:
>
> > BTW, could you please move the rcu_dereference in in_dev_get()
> > into the if clause? The barrier is not needed when ip_ptr is
> > NULL.
>
> The trouble with that may be that there are three events, the
> dereference, the assignment, and the conditional test. The
> rcu_dereference() is meant to assure deferred destruction
> throughout.
The deferred destruction is guaranteed here by the reference count.
The only purpose served by rcu_dereference() in in_dev_get() is to
prevent the user from seeing pre-initialisation data.
When the pointer is NULL, you can't see any data at all, let alone
pre-initialisation data.
Cheers,
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