On Fri, Sep 30, 2016 at 09:04:09AM +0200, Hannes Reinecke wrote:

The list of attached 'rdata' remote port structures is RCU
protected, so there is no need to take the 'disc_mutex' when
traversing it.
Rather we should be using rcu_read_lock() and kref_get_unless_zero()
to validate the entries.
We need, however, take the disc_mutex when deleting an entry;
otherwise we risk clashes with list_add.

Signed-off-by: Hannes Reinecke <hare@suse.com>
---

Acked-by: Johannes Thumshirn <jth@kernel.org>

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Johannes Thumshirn                                          Storage
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