linux-kernel - [PATCH] cgroups: remove redundant get/put of css_set from css_set_check

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Message-Id: <1323987686-17968-1-git-send-email-msb@chromium.org>
Date:	Thu, 15 Dec 2011 14:21:26 -0800
From:	Mandeep Singh Baines <msb@...omium.org>
To:	Tejun Heo <tj@...nel.org>, Li Zefan <lizf@...fujitsu.com>,
	linux-kernel@...r.kernel.org
Cc:	Mandeep Singh Baines <msb@...omium.org>, Tejun Heo <tj@...nel.org>,
	Li Zefan <lizf@...fujitsu.com>,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	Paul Menage <paul@...lmenage.org>
Subject: [PATCH] cgroups: remove redundant get/put of css_set from css_set_check_fetched()

We already have a reference to all elements in newcg_list.

Signed-off-by: Mandeep Singh Baines <msb@...omium.org>
Cc: Tejun Heo <tj@...nel.org>
Cc: Li Zefan <lizf@...fujitsu.com>
Cc: containers@...ts.linux-foundation.org
Cc: cgroups@...r.kernel.org
Cc: Paul Menage <paul@...lmenage.org>
---
 kernel/cgroup.c |   10 ++--------
 1 files changed, 2 insertions(+), 8 deletions(-)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index d9d5648..a7e00b9 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1935,23 +1935,17 @@ static bool css_set_check_fetched(struct cgroup *cgrp,
 
 	read_lock(&css_set_lock);
 	newcg = find_existing_css_set(cg, cgrp, template);
-	if (newcg)
-		get_css_set(newcg);
 	read_unlock(&css_set_lock);
 
 	/* doesn't exist at all? */
 	if (!newcg)
 		return false;
 	/* see if it's already in the list */
-	list_for_each_entry(cg_entry, newcg_list, links) {
-		if (cg_entry->cg == newcg) {
-			put_css_set(newcg);
+	list_for_each_entry(cg_entry, newcg_list, links)
+		if (cg_entry->cg == newcg)
 			return true;
-		}
-	}
 
 	/* not found */
-	put_css_set(newcg);
 	return false;
 }
 
-- 
1.7.3.1

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