linux-kernel - [PATCH 2/8] dm core: tidy local

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Message-Id: <20081003.111010.71085263.k-ueda@ct.jp.nec.com>
Date:	Fri, 03 Oct 2008 11:10:10 -0400 (EDT)
From:	Kiyoshi Ueda <k-ueda@...jp.nec.com>
To:	agk@...hat.com
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	dm-devel@...hat.com, mbroz@...hat.com, j-nomura@...jp.nec.com,
	k-ueda@...jp.nec.com
Subject: [PATCH 2/8] dm core: tidy local_init

This patch tidies local_init() as preparation for another patch
(PATCH 3), which creates some kmem_cache for request-based dm.
No functional change.

This patch is just a clean up of the codes and not functionally
related to request-based dm.  But included here due to literal
dependency.

Signed-off-by: Kiyoshi Ueda <k-ueda@...jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@...jp.nec.com>
Cc: Alasdair G Kergon <agk@...hat.com>
---
 drivers/md/dm.c |   34 +++++++++++++++++-----------------
 1 files changed, 17 insertions(+), 17 deletions(-)

Index: 2.6.27-rc8/drivers/md/dm.c
===================================================================
--- 2.6.27-rc8.orig/drivers/md/dm.c
+++ 2.6.27-rc8/drivers/md/dm.c
@@ -150,40 +150,40 @@ static struct kmem_cache *_tio_cache;
 
 static int __init local_init(void)
 {
-	int r;
+	int r = -ENOMEM;
 
 	/* allocate a slab for the dm_ios */
 	_io_cache = KMEM_CACHE(dm_io, 0);
 	if (!_io_cache)
-		return -ENOMEM;
+		return r;
 
 	/* allocate a slab for the target ios */
 	_tio_cache = KMEM_CACHE(dm_target_io, 0);
-	if (!_tio_cache) {
-		kmem_cache_destroy(_io_cache);
-		return -ENOMEM;
-	}
+	if (!_tio_cache)
+		goto out_free_io_cache;
 
 	r = dm_uevent_init();
-	if (r) {
-		kmem_cache_destroy(_tio_cache);
-		kmem_cache_destroy(_io_cache);
-		return r;
-	}
+	if (r)
+		goto out_free_tio_cache;
 
 	_major = major;
 	r = register_blkdev(_major, _name);
-	if (r < 0) {
-		kmem_cache_destroy(_tio_cache);
-		kmem_cache_destroy(_io_cache);
-		dm_uevent_exit();
-		return r;
-	}
+	if (r < 0)
+		goto out_uevent_exit;
 
 	if (!_major)
 		_major = r;
 
 	return 0;
+
+out_uevent_exit:
+	dm_uevent_exit();
+out_free_tio_cache:
+	kmem_cache_destroy(_tio_cache);
+out_free_io_cache:
+	kmem_cache_destroy(_io_cache);
+
+	return r;
 }
 
 static void local_exit(void)
--
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