From: Shaohua Li <shli@kernel.org>
Date: Thu, 19 Jul 2012 10:49:56 +0000 (+1000)
Subject: block: stack unplug
X-Git-Tag: next-20120724~52^2~17
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=747d8879acc8ff4ac1b8a3937144d18b3d91af0c;p=karo-tx-linux.git

block: stack unplug

MD raid1 prepares to dispatch request in unplug callback. If make_request in
low level queue also uses unplug callback to dispatch request, the low level
queue's unplug callback will not be called. Recheck the callback list helps
this case.

Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: NeilBrown <neilb@suse.de>
---

diff --git a/block/blk-core.c b/block/blk-core.c
index 7296d3d8dca3..bf38a5b7dd0e 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2900,17 +2900,16 @@ static void flush_plug_callbacks(struct blk_plug *plug)
 {
 	LIST_HEAD(callbacks);
 
-	if (list_empty(&plug->cb_list))
-		return;
-
-	list_splice_init(&plug->cb_list, &callbacks);
+	while (!list_empty(&plug->cb_list)) {
+		list_splice_init(&plug->cb_list, &callbacks);
 
-	while (!list_empty(&callbacks)) {
-		struct blk_plug_cb *cb = list_first_entry(&callbacks,
+		while (!list_empty(&callbacks)) {
+			struct blk_plug_cb *cb = list_first_entry(&callbacks,
 							  struct blk_plug_cb,
 							  list);
-		list_del(&cb->list);
-		cb->callback(cb);
+			list_del(&cb->list);
+			cb->callback(cb);
+		}
 	}
 }