On Tue, Sep 01, 2015 at 03:02:29PM +0200, Hannes Reinecke wrote:
> >> + rcu_read_lock();
> >> + pg = rcu_dereference(h->pg);
> >> + if (!pg) {
> >> + rcu_read_unlock();
> >> + return -ENXIO;
> >> + }
> >
> > What is this rcu_read_lock supposed to protect against given
> > that struct alua_port_group isn't RCU freed? I think this needs
> > to be another kref_get_unless_zero.
> >
> It's not freed now, but it'll be with one of the next patches (ie with
> the 'rescan' patch).
> I just kept it here for consistency, following the rule to always
> enclose 'rcu_dereference' with 'rcu_read_lock()/rcu_read_unlock()'
> pairs. Irrespective on whether it's being freed or not.
After this patch this is the only RCU call in the driver. I don't
think adding it here make any sense.
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