linux-kernel - [PATCH 9/9] fs/ecryptfs: Eliminate useless code

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Message-ID: <Pine.LNX.4.64.1001161700100.28745@ask.diku.dk>
Date:	Sat, 16 Jan 2010 17:00:26 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	Tyler Hicks <tyhicks@...ux.vnet.ibm.com>,
	Dustin Kirkland <kirkland@...onical.com>,
	ecryptfs-devel@...ts.launchpad.net, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH 9/9] fs/ecryptfs: Eliminate useless code

From: Julia Lawall <julia@...u.dk>

The variable lower_dentry is initialized twice to the same (side effect-free)
expression.  Drop one initialization.

A simplified version of the semantic match that finds this problem is:
(http://coccinelle.lip6.fr/)

// <smpl>
@forall@
idexpression *x;
identifier f!=ERR_PTR;
@@

x = f(...)
... when != x
(
x = f(...,<+...x...+>,...)
|
* x = f(...)
)
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 fs/ecryptfs/file.c                  |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c
index 1744f17..7bf1031 100644
--- a/fs/ecryptfs/file.c
+++ b/fs/ecryptfs/file.c
@@ -158,9 +158,9 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
 	struct dentry *ecryptfs_dentry = file->f_path.dentry;
 	/* Private value of ecryptfs_dentry allocated in
 	 * ecryptfs_lookup() */
-	struct dentry *lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
+	struct dentry *lower_dentry;
 	struct ecryptfs_file_info *file_info;
 
 	mount_crypt_stat = &ecryptfs_superblock_to_private(
--
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