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authorLi Zefan <lizf@cn.fujitsu.com>2008-10-29 22:00:54 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-30 19:38:45 +0100
commit51308ee59dee1136ed599d875ea8968d7be55c91 (patch)
tree8976509c5fbf8171774e7eb7007cf0d4d00f0f83
parentfreezer_cg: use thaw_process() in unfreeze_cgroup() (diff)
downloadlinux-51308ee59dee1136ed599d875ea8968d7be55c91.tar.xz
linux-51308ee59dee1136ed599d875ea8968d7be55c91.zip
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@cn.fujitsu.com> Acked-by: Cedric Le Goater <clg@fr.ibm.com> Acked-by: Matt Helsley <matthltc@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/cgroup_freezer.c19
1 files changed, 7 insertions, 12 deletions
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index 5e6d26b66e88..7fa476f01d05 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);