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This patch converts se_tpg->acl_node_lock to struct mutex, so that ->acl_node_acl walkers in core_clear_lun_from_tpg() can block when calling core_disable_device_list_for_node(). It also updates core_dev_add_lun() to hold ->acl_node_mutex when calling core_tpg_add_node_to_devs() to build ->lun_entry_hlist for dynamically generated se_node_acl. Reviewed-by: Hannes Reinecke <hare@suse.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>