scsi: libfc: Fixup disc_mutex handling in fcoe module

scsi: libfc: Fixup disc_mutex handling in fcoe module

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>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Orabug: 29511036

(cherry picked from commit a407c593398c886db4fa1fc5c6fec55e61187a09)
Signed-off-by: Rajan Shanmugavelu <rajan.shanmugavelu@oracle.com>
Reviewed-by: Joe Jin <joe.jin@oracle.com>
Signed-off-by: Brian Maly <brian.maly@oracle.com>