From a60327107b56573c305ecc78e471dbdbb4d2f426 Mon Sep 17 00:00:00 2001
From: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Date: Mon, 7 Mar 2011 09:28:09 +0100
Subject: [PATCH] cfq-iosched: Fix update_vdisktime logic
The update_vdisktime logic is broken since commit
b54ce60eb7f61f8e314b8b241b0469eda3bb1d42, st->min_vdisktime never makes
a progress. Fix it.
Thanks Vivek for pointing it out.
Signed-off-by: Gui Jianfeng <guijianfen@cn.fujitsu.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
---
block/cfq-iosched.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 135b1a48da23..938ae52aa927 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -557,15 +557,13 @@ static inline u64 min_vdisktime(u64 min_vdisktime, u64 vdisktime)
static void update_min_vdisktime(struct cfq_rb_root *st)
{
- u64 vdisktime = st->min_vdisktime;
struct cfq_group *cfqg;
if (st->left) {
cfqg = rb_entry_cfqg(st->left);
- vdisktime = min_vdisktime(vdisktime, cfqg->vdisktime);
+ st->min_vdisktime = max_vdisktime(st->min_vdisktime,
+ cfqg->vdisktime);
}
-
- st->min_vdisktime = max_vdisktime(st->min_vdisktime, vdisktime);
}
/*
--
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