linux-kernel - [PATCH v2] fs-fat: Less function calls in fat_fill

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Message-ID: <54796B5E.5040707@users.sourceforge.net>
Date:	Sat, 29 Nov 2014 07:44:46 +0100
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	Julia Lawall <julia.lawall@...6.fr>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
CC:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	trivial@...nel.org, Coccinelle <cocci@...teme.lip6.fr>
Subject: [PATCH v2] fs-fat: Less function calls in fat_fill_super() after
 error detection

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sat, 29 Nov 2014 07:37:34 +0100

The iput() function was called in an inefficient way by the implementation
of the fat_fill_super() function in case of an allocation failure.
The corresponding source code was improved by deletion of two unnecessary
null pointer checks and a few adjustments for jump labels.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 fs/fat/inode.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 756aead..a39afe8 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -1716,20 +1716,20 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
 
 	fsinfo_inode = new_inode(sb);
 	if (!fsinfo_inode)
-		goto out_fail;
+		goto fsinfo_inode_failure;
 	fsinfo_inode->i_ino = MSDOS_FSINFO_INO;
 	sbi->fsinfo_inode = fsinfo_inode;
 	insert_inode_hash(fsinfo_inode);
 
 	root_inode = new_inode(sb);
 	if (!root_inode)
-		goto out_fail;
+		goto failure_exit;
 	root_inode->i_ino = MSDOS_ROOT_INO;
 	root_inode->i_version = 1;
 	error = fat_read_root(root_inode);
 	if (error < 0) {
 		iput(root_inode);
-		goto out_fail;
+		goto failure_exit;
 	}
 	error = -ENOMEM;
 	insert_inode_hash(root_inode);
@@ -1737,7 +1737,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
 	sb->s_root = d_make_root(root_inode);
 	if (!sb->s_root) {
 		fat_msg(sb, KERN_ERR, "get root inode failed");
-		goto out_fail;
+		goto failure_exit;
 	}
 
 	if (sbi->options.discard) {
@@ -1756,11 +1756,13 @@ out_invalid:
 	if (!silent)
 		fat_msg(sb, KERN_INFO, "Can't find a valid FAT filesystem");
 
+failure_exit:
+	iput(fsinfo_inode);
+
+fsinfo_inode_failure:
+	iput(fat_inode);
+
 out_fail:
-	if (fsinfo_inode)
-		iput(fsinfo_inode);
-	if (fat_inode)
-		iput(fat_inode);
 	unload_nls(sbi->nls_io);
 	unload_nls(sbi->nls_disk);
 	if (sbi->options.iocharset != fat_default_iocharset)
-- 
2.1.3

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