---

yaml
---
r: 117704
b: refs/heads/master
c: 6c5121b
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 9d11251709f31d49c8167a619d4475fdf6cd7f73
+refs/heads/master: 6c5121b78ba5c70a9990e2af6cb4d6bbffe0d4d8

trunk/drivers/scsi/scsi_lib.c

@@ -1464,6 +1464,37 @@ static inline int scsi_host_queue_ready(struct request_queue *q,
 	return 1;
 }
 
+/*
+ * Busy state exporting function for request stacking drivers.
+ *
+ * For efficiency, no lock is taken to check the busy state of
+ * shost/starget/sdev, since the returned value is not guaranteed and
+ * may be changed after request stacking drivers call the function,
+ * regardless of taking lock or not.
+ *
+ * When scsi can't dispatch I/Os anymore and needs to kill I/Os
+ * (e.g. !sdev), scsi needs to return 'not busy'.
+ * Otherwise, request stacking drivers may hold requests forever.
+ */
+static int scsi_lld_busy(struct request_queue *q)
+{
+	struct scsi_device *sdev = q->queuedata;
+	struct Scsi_Host *shost;
+	struct scsi_target *starget;
+
+	if (!sdev)
+		return 0;
+
+	shost = sdev->host;
+	starget = scsi_target(sdev);
+
+	if (scsi_host_in_recovery(shost) || scsi_host_is_busy(shost) ||
+	    scsi_target_is_busy(starget) || scsi_device_is_busy(sdev))
+		return 1;
+
+	return 0;
+}
+
 /*
  * Kill a request for a dead device
  */
@@ -1767,6 +1798,7 @@ struct request_queue *scsi_alloc_queue(struct scsi_device *sdev)
 	blk_queue_prep_rq(q, scsi_prep_fn);
 	blk_queue_softirq_done(q, scsi_softirq_done);
 	blk_queue_rq_timed_out(q, scsi_times_out);
+	blk_queue_lld_busy(q, scsi_lld_busy);
 	return q;
 }