+static int scsifront_resume(struct xenbus_device *dev)
+{
+ struct vscsifrnt_info *info = dev_get_drvdata(&dev->dev);
+ struct Scsi_Host *host = info->host;
+ int err;
+
+ spin_lock_irq(host->host_lock);
+
+ /* Finish all still pending commands. */
+ scsifront_finish_all(info);
+
+ spin_unlock_irq(host->host_lock);
+
+ /* Reconnect to dom0. */
+ scsifront_free_ring(info);
+ err = scsifront_init_ring(info);
+ if (err) {
+ dev_err(&dev->dev, "fail to resume %d\n", err);
+ scsi_host_put(host);
+ return err;
+ }
+
+ xenbus_switch_state(dev, XenbusStateInitialised);
+
+ return 0;
+}
+
+static int scsifront_suspend(struct xenbus_device *dev)
+{
+ struct vscsifrnt_info *info = dev_get_drvdata(&dev->dev);
+ struct Scsi_Host *host = info->host;
+ int err = 0;
+
+ /* No new commands for the backend. */
+ spin_lock_irq(host->host_lock);
+ info->pause = 1;
+ while (info->callers && !err) {
+ info->waiting_pause = 1;
+ info->wait_ring_available = 0;
+ spin_unlock_irq(host->host_lock);
+ wake_up(&info->wq_sync);
+ err = wait_event_interruptible(info->wq_pause,
+ !info->waiting_pause);
+ spin_lock_irq(host->host_lock);
+ }
+ spin_unlock_irq(host->host_lock);
+ return err;
+}
+