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Subject[PATCH 20/24] sysfs: Normalize error handling in sysfs_fill_inode
From: Eric W. Biederman <ebiederm@xmission.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.

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.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,
--
1.6.3.1.54.g99dd.dirty


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