On 01/31/14 10:30, Hannes Reinecke wrote:
> +static void alua_check(struct scsi_device *sdev)
> +{
> + struct alua_dh_data *h = get_alua_data(sdev);
> + struct alua_port_group *pg;
> +
> + if (!h)
> + return;
> +
> + rcu_read_lock();
> + pg = rcu_dereference(h->pg);
> + if (pg) {
> + kref_get(&pg->kref);
> + rcu_read_unlock();
> + alua_rtpg_queue(pg, sdev, NULL);
> + kref_put(&pg->kref, release_port_group);
> + } else
> + rcu_read_unlock();
> +}
>From the implementation it seems to me like the target port group data
is kept just as long as it is in use ? Has it been considered to keep
that data as long as the sdev exists instead ? I think that would result
in far fewer reference count manipulations and hence in code that is
easier to read and to verify.
Thanks,
Bart.
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