[PATCH] avoid unnecessary assignment in lookup_bdev()

[Coly Li <coly.li@suse.de>]

In normal cases, lookup_bdev() should return successfully, therefore it's not a good idea to always
assign error values before checking truth/false conditions. This patch modifies code to only assign
error value in necessary false conditions.

If I missed something, please correct me.

Signed-off-by: Coly Li <coly.li@suse.de>
---
 fs/block_dev.c |   15 +++++++++------
 1 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 99e0ae1..10b656f 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1282,16 +1282,19 @@ struct block_device *lookup_bdev(const char *pathname)
 		return ERR_PTR(error);

 	inode = path.dentry->d_inode;
-	error = -ENOTBLK;
-	if (!S_ISBLK(inode->i_mode))
+	if (!S_ISBLK(inode->i_mode)) {
+		error = -ENOTBLK;
 		goto fail;
-	error = -EACCES;
-	if (path.mnt->mnt_flags & MNT_NODEV)
+	}
+	if (path.mnt->mnt_flags & MNT_NODEV) {
+		error = -EACCES;
 		goto fail;
-	error = -ENOMEM;
+	}
 	bdev = bd_acquire(inode);
-	if (!bdev)
+	if (!bdev) {
+		error = -ENOMEM;
 		goto fail;
+	}
 out:
 	path_put(&path);
 	return bdev;
-- 
Coly Li
SuSE PRC Labs