linux-kernel - [PATCH 20/20] sysfs: Normalize error handling in sysfs_fill

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Date:	Wed, 20 May 2009 17:28:14 -0700
From:	"Eric W. Biederman" <ebiederm@...ssion.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	<linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	<linux-fsdevel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Eric W. Biederman" <ebiederm@...stanetworks.com>
Subject: [PATCH 20/20] sysfs: Normalize error handling in sysfs_fill_inode

From: Eric W. Biederman <ebiederm@...ssion.com>

Use a single error exit path instead of doing whatever
is the required cleanup at each point we find the error.
Ultimately this should make the code more maintainable.

Signed-off-by: Eric W. Biederman <ebiederm@...stanetworks.com>
---
 fs/sysfs/mount.c |   16 +++++++++++-----
 1 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index 0cb1088..1dd023a 100644
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -41,8 +41,9 @@ struct sysfs_dirent sysfs_root = {
 
 static int sysfs_fill_super(struct super_block *sb, void *data, int silent)
 {
-	struct inode *inode;
-	struct dentry *root;
+	struct inode *inode = NULL;
+	struct dentry *root = NULL;
+	int error;
 
 	sb->s_blocksize = PAGE_CACHE_SIZE;
 	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
@@ -51,24 +52,29 @@ static int sysfs_fill_super(struct super_block *sb, void *data, int silent)
 	sb->s_time_gran = 1;
 
 	/* get root inode, initialize and unlock it */
+	error = -ENOMEM;
 	mutex_lock(&sysfs_mutex);
 	inode = sysfs_get_inode(sb, &sysfs_root);
 	mutex_unlock(&sysfs_mutex);
 	if (!inode) {
 		pr_debug("sysfs: could not get root inode\n");
-		return -ENOMEM;
+		goto err_out;
 	}
 
 	/* instantiate and link root dentry */
+	error = -ENOMEM;
 	root = d_alloc_root(inode);
 	if (!root) {
 		pr_debug("%s: could not get root dentry!\n",__func__);
-		iput(inode);
-		return -ENOMEM;
+		goto err_out;
 	}
 	root->d_fsdata = &sysfs_root;
 	sb->s_root = root;
 	return 0;
+err_out:
+	dput(root);
+	iput(inode);
+	return error;
 }
 
 static int sysfs_get_sb(struct file_system_type *fs_type,
-- 
1.6.1.2.350.g88cc

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