+static void alua_rtpg_work(struct work_struct *work)
+{
+ struct alua_port_group *pg =
+ container_of(work, struct alua_port_group, rtpg_work.work);
+ struct scsi_device *sdev;
+ LIST_HEAD(qdata_list);
+ int err = SCSI_DH_OK;
+ struct alua_queue_data *qdata, *tmp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&pg->lock, flags);
+ sdev = pg->rtpg_sdev;
+ if (!sdev) {
+ WARN_ON(pg->flags & ALUA_PG_RUN_RTPG);
+ WARN_ON(pg->flags & ALUA_PG_RUN_STPG);
+ spin_unlock_irqrestore(&pg->lock, flags);
+ return;
+ }
+ pg->flags |= ALUA_PG_RUNNING;
+ if (pg->flags & ALUA_PG_RUN_RTPG) {
+ pg->flags &= ~ALUA_PG_RUN_RTPG;
+ spin_unlock_irqrestore(&pg->lock, flags);
+ err = alua_rtpg(sdev, pg);
+ spin_lock_irqsave(&pg->lock, flags);
+ if (err == SCSI_DH_RETRY) {
+ pg->flags &= ~ALUA_PG_RUNNING;
+ pg->flags |= ALUA_PG_RUN_RTPG;
+ spin_unlock_irqrestore(&pg->lock, flags);
+ queue_delayed_work(kaluad_wq, &pg->rtpg_work,
+ pg->interval * HZ);
+ return;
+ }
+ if (err != SCSI_DH_OK)
+ pg->flags &= ~ALUA_PG_RUN_STPG;
+ }
+ if (pg->flags & ALUA_PG_RUN_STPG) {
+ pg->flags &= ~ALUA_PG_RUN_STPG;
+ spin_unlock_irqrestore(&pg->lock, flags);
+ err = alua_stpg(sdev, pg);
+ spin_lock_irqsave(&pg->lock, flags);
+ if (err == SCSI_DH_RETRY) {
+ pg->flags |= ALUA_PG_RUN_RTPG;
+ pg->interval = 0;
+ pg->flags &= ~ALUA_PG_RUNNING;
+ spin_unlock_irqrestore(&pg->lock, flags);
+ queue_delayed_work(kaluad_wq, &pg->rtpg_work,
+ pg->interval * HZ);
+ return;
+ }
+ }
+
+ list_splice_init(&pg->rtpg_list, &qdata_list);
+ pg->rtpg_sdev = NULL;
+ spin_unlock_irqrestore(&pg->lock, flags);
+
+ list_for_each_entry_safe(qdata, tmp, &qdata_list, entry) {
+ list_del(&qdata->entry);
+ if (qdata->callback_fn)
+ qdata->callback_fn(qdata->callback_data, err);
+ kfree(qdata);
+ }
+ spin_lock_irqsave(&pg->lock, flags);
+ pg->flags &= ~ALUA_PG_RUNNING;
+ spin_unlock_irqrestore(&pg->lock, flags);
+ scsi_device_put(sdev);
+ kref_put(&pg->kref, release_port_group);
+}
+
+static void alua_rtpg_queue(struct alua_port_group *pg,
+ struct scsi_device *sdev,
+ struct alua_queue_data *qdata)
+{
+ int start_queue = 0;
+ unsigned long flags;
+
+ if (!pg)
+ return;
+
+ spin_lock_irqsave(&pg->lock, flags);
+ if (qdata) {
+ list_add_tail(&qdata->entry, &pg->rtpg_list);
+ pg->flags |= ALUA_PG_RUN_STPG;
+ }
+ if (pg->rtpg_sdev == NULL) {
+ pg->interval = 0;
+ pg->flags |= ALUA_PG_RUN_RTPG;
+ kref_get(&pg->kref);
+ pg->rtpg_sdev = sdev;
+ scsi_device_get(sdev);
+ start_queue = 1;
+ }
+ spin_unlock_irqrestore(&pg->lock, flags);
+
+ if (start_queue &&
+ !queue_delayed_work(kaluad_wq, &pg->rtpg_work,
+ msecs_to_jiffies(ALUA_RTPG_DELAY_MSECS))) {
+ scsi_device_put(sdev);
+ kref_put(&pg->kref, release_port_group);
+ }
+}
+