linux-kernel - [PATCHv2 08/24] sys_swapon: move setting of error nearer use

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Date:	Sat,  5 Mar 2011 13:42:09 -0300
From:	Cesar Eduardo Barros <cesarb@...arb.net>
To:	linux-mm@...ck.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Jens Axboe <jaxboe@...ionio.com>, linux-kernel@...r.kernel.org,
	Eric B Munson <emunson@...bm.net>,
	Cesar Eduardo Barros <cesarb@...arb.net>
Subject: [PATCHv2 08/24] sys_swapon: move setting of error nearer use

Move the setting of the error variable nearer the goto in a few places.

Avoids calling PTR_ERR() if not IS_ERR() in two places, and makes the
error condition more explicit in two other places.

Signed-off-by: Cesar Eduardo Barros <cesarb@...arb.net>
Tested-by: Eric B Munson <emunson@...bm.net>
Acked-by: Eric B Munson <emunson@...bm.net>
---
 mm/swapfile.c |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 8893c10..55a50ef 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1917,14 +1917,14 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
 		return PTR_ERR(p);
 
 	name = getname(specialfile);
-	error = PTR_ERR(name);
 	if (IS_ERR(name)) {
+		error = PTR_ERR(name);
 		name = NULL;
 		goto bad_swap_2;
 	}
 	swap_file = filp_open(name, O_RDWR|O_LARGEFILE, 0);
-	error = PTR_ERR(swap_file);
 	if (IS_ERR(swap_file)) {
+		error = PTR_ERR(swap_file);
 		swap_file = NULL;
 		goto bad_swap_2;
 	}
@@ -1933,17 +1933,17 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
 	mapping = swap_file->f_mapping;
 	inode = mapping->host;
 
-	error = -EBUSY;
 	for (i = 0; i < nr_swapfiles; i++) {
 		struct swap_info_struct *q = swap_info[i];
 
 		if (q == p || !q->swap_file)
 			continue;
-		if (mapping == q->swap_file->f_mapping)
+		if (mapping == q->swap_file->f_mapping) {
+			error = -EBUSY;
 			goto bad_swap;
+		}
 	}
 
-	error = -EINVAL;
 	if (S_ISBLK(inode->i_mode)) {
 		bdev = bdgrab(I_BDEV(inode));
 		error = blkdev_get(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL,
@@ -1968,6 +1968,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
 			goto bad_swap;
 		}
 	} else {
+		error = -EINVAL;
 		goto bad_swap;
 	}
 
-- 
1.7.4

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