linux-kernel - [PATCH] mm:vmstat - Removed debug fs entries on failure of file creation and made extfrag_debug

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Date:	Tue, 24 Apr 2012 00:20:12 +0530
From:	Sasikanth V <sasikanth.v19@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, Christoph Lameter <cl@...ux.com>,
	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Sasikanth V <sasikanth.v19@...il.com>
Subject: [PATCH] mm:vmstat - Removed debug fs entries on failure of file creation and made extfrag_debug_root dentry local

Removed debug fs files and directory on failure. Since no one using "extfrag_debug_root" dentry outside of function
extfrag_debug_init made it local to the function.

Signed-off-by: Sasikanth V <sasikanth.v19@...il.com>
---
 mm/vmstat.c |   11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/mm/vmstat.c b/mm/vmstat.c
index f600557..ddae476 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1220,7 +1220,6 @@ module_init(setup_vmstat)
 #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_COMPACTION)
 #include <linux/debugfs.h>
 
-static struct dentry *extfrag_debug_root;
 
 /*
  * Return an index indicating how much of the available free memory is
@@ -1358,17 +1357,23 @@ static const struct file_operations extfrag_file_ops = {
 
 static int __init extfrag_debug_init(void)
 {
+	struct dentry *extfrag_debug_root;
+
 	extfrag_debug_root = debugfs_create_dir("extfrag", NULL);
 	if (!extfrag_debug_root)
 		return -ENOMEM;
 
 	if (!debugfs_create_file("unusable_index", 0444,
-			extfrag_debug_root, NULL, &unusable_file_ops))
+			extfrag_debug_root, NULL, &unusable_file_ops)) {
+		debugfs_remove (extfrag_debug_root);
 		return -ENOMEM;
+	}
 
 	if (!debugfs_create_file("extfrag_index", 0444,
-			extfrag_debug_root, NULL, &extfrag_file_ops))
+			extfrag_debug_root, NULL, &extfrag_file_ops)) {
+		debugfs_remove_recursive (extfrag_debug_root);
 		return -ENOMEM;
+	}
 
 	return 0;
 }
-- 
1.7.3.4

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