linux-kernel - [PATCH 4/4] freezer_cg: simplify freezer_change

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Message-ID: <48FD27E1.5070903@cn.fujitsu.com>
Date:	Tue, 21 Oct 2008 08:52:49 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Matt Helsley <matthltc@...ibm.com>,
	Cedric Le Goater <clg@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>
Subject: [PATCH 4/4] freezer_cg: simplify freezer_change_state()

Just call unfreeze_cgroup() if goal_state == THAWED, and call
try_to_freeze_cgroup() if goal_state == FROZEN.

No behavior has been changed.

Signed-off-by: Li Zefan <lizf@...fujitsu.com>
---
 kernel/cgroup_freezer.c |   19 +++++++------------
 1 files changed, 7 insertions(+), 12 deletions(-)

diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index 3ea57e4..cdef2d8 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -296,27 +296,22 @@ static int freezer_change_state(struct cgroup *cgroup,
 	int retval = 0;
 
 	freezer = cgroup_freezer(cgroup);
+
 	spin_lock_irq(&freezer->lock);
+
 	update_freezer_state(cgroup, freezer);
 	if (goal_state == freezer->state)
 		goto out;
-	switch (freezer->state) {
+
+	switch (goal_state) {
 	case CGROUP_THAWED:
-		retval = try_to_freeze_cgroup(cgroup, freezer);
+		unfreeze_cgroup(cgroup, freezer);
 		break;
-	case CGROUP_FREEZING:
-		if (goal_state == CGROUP_FROZEN) {
-			/* Userspace is retrying after
-			 * "/bin/echo FROZEN > freezer.state" returned -EBUSY */
-			retval = try_to_freeze_cgroup(cgroup, freezer);
-			break;
-		}
-		/* state == FREEZING and goal_state == THAWED, so unfreeze */
 	case CGROUP_FROZEN:
-		unfreeze_cgroup(cgroup, freezer);
+		retval = try_to_freeze_cgroup(cgroup, freezer);
 		break;
 	default:
-		break;
+		BUG();
 	}
 out:
 	spin_unlock_irq(&freezer->lock);
-- 
1.5.4.rc3

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