scsi: tcmu: refactor nl wr_cache attr with new helpers
use new netlink events helpers tcmu_netlink_init() and tcmu_netlink_send() to refactor netlink event attribute TCMU_ATTR_WRITECACHE(belongs to TCMU_CMD_RECONFIG_DEVICE) which is also emulate_write_cache in configFS. Removed tcmu_netlink_event() since we have new netlink events helpers now. Signed-off-by: Zhu Lingshan <lszhu@suse.com> Acked-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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