linux-kernel - [PATCH 8/8] fs/9p: Less function calls in v9fs_vfs_mknod

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Date:	Sun, 28 Dec 2014 21:50:18 +0100
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	Eric Van Hensbergen <ericvh@...il.com>,
	Latchesar Ionkov <lucho@...kov.net>,
	Ron Minnich <rminnich@...dia.gov>,
	v9fs-developer@...ts.sourceforge.net
CC:	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: [PATCH 8/8] fs/9p: Less function calls in v9fs_vfs_mknod_dotl() after
 error detection

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sun, 28 Dec 2014 13:36:28 +0100

The p9_client_clunk() function was called in four cases by the
v9fs_vfs_mknod_dotl() function during error handling even if the passed
variable "fid" contained a null pointer. The v9fs_put_acl() function could
also be unnecessarily called with null pointers.

* This implementation detail could be improved by the introduction of
  two jump labels.

* Let us delete also two unnecessary variable assignments there.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 fs/9p/vfs_inode_dotl.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index 3b38dda..ff3c26a 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -832,8 +832,7 @@ v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 	if (IS_ERR(dfid)) {
 		err = PTR_ERR(dfid);
 		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
-		dfid = NULL;
-		goto error;
+		goto exit;
 	}
 
 	gid = v9fs_get_fsgid_for_create(dir);
@@ -843,13 +842,13 @@ v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 	if (err) {
 		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
 			 err);
-		goto error;
+		goto exit;
 	}
 	name = (char *) dentry->d_name.name;
 
 	err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 	if (err < 0)
-		goto error;
+		goto put_acl;
 
 	v9fs_invalidate_inode_attr(dir);
 	fid = p9_client_walk(dfid, 1, &name, 1);
@@ -857,8 +856,7 @@ v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 		err = PTR_ERR(fid);
 		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 			 err);
-		fid = NULL;
-		goto error;
+		goto put_acl;
 	}
 
 	/* instantiate inode and assign the unopened fid to the dentry */
@@ -890,7 +888,9 @@ v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 	}
 error:
 	p9_client_clunk(fid);
+put_acl:
 	v9fs_put_acl(dacl, pacl);
+exit:
 	return err;
 }
 
-- 
2.2.1

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