---

yaml
---
r: 258622
b: refs/heads/master
c: b4726a9
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 2b727c6300b49352f80f63704bb50c256949e95e
+refs/heads/master: b4726a9df270859898e254b6eee67a28f38b34d3

trunk/drivers/block/xen-blkback/blkback.c

@@ -458,7 +458,8 @@ static void end_block_io_op(struct bio *bio, int error)
  * (which has the sectors we want, number of them, grant references, etc),
  * and transmute  it to the block API to hand it over to the proper block disk.
  */
-static int do_block_io_op(struct xen_blkif *blkif)
+static int
+__do_block_io_op(struct xen_blkif *blkif)
 {
 	union blkif_back_rings *blk_rings = &blkif->blk_rings;
 	struct blkif_request req;
@@ -515,6 +516,23 @@ static int do_block_io_op(struct xen_blkif *blkif)
 	return more_to_do;
 }
 
+static int
+do_block_io_op(struct xen_blkif *blkif)
+{
+	union blkif_back_rings *blk_rings = &blkif->blk_rings;
+	int more_to_do;
+
+	do {
+		more_to_do = __do_block_io_op(blkif);
+		if (more_to_do)
+			break;
+
+		RING_FINAL_CHECK_FOR_REQUESTS(&blk_rings->common, more_to_do);
+	} while (more_to_do);
+
+	return more_to_do;
+}
+
 /*
  * Transmutation of the 'struct blkif_request' to a proper 'struct bio'
  * and call the 'submit_bio' to pass it to the underlying storage.
@@ -700,7 +718,6 @@ static void make_response(struct xen_blkif *blkif, u64 id,
 	struct blkif_response  resp;
 	unsigned long     flags;
 	union blkif_back_rings *blk_rings = &blkif->blk_rings;
-	int more_to_do = 0;
 	int notify;
 
 	resp.id        = id;
@@ -727,22 +744,7 @@ static void make_response(struct xen_blkif *blkif, u64 id,
 	}
 	blk_rings->common.rsp_prod_pvt++;
 	RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&blk_rings->common, notify);
-	if (blk_rings->common.rsp_prod_pvt == blk_rings->common.req_cons) {
-		/*
-		 * Tail check for pending requests. Allows frontend to avoid
-		 * notifications if requests are already in flight (lower
-		 * overheads and promotes batching).
-		 */
-		RING_FINAL_CHECK_FOR_REQUESTS(&blk_rings->common, more_to_do);
-
-	} else if (RING_HAS_UNCONSUMED_REQUESTS(&blk_rings->common)) {
-		more_to_do = 1;
-	}
-
 	spin_unlock_irqrestore(&blkif->blk_ring_lock, flags);
-
-	if (more_to_do)
-		blkif_notify_work(blkif);
 	if (notify)
 		notify_remote_via_irq(blkif->irq);
 }