linux-kernel - [PATCHv2 20/24] sys_swapon: simplify error flow in setup_swap_map_and

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Message-Id: <1299343345-3984-21-git-send-email-cesarb@cesarb.net>
Date:	Sat,  5 Mar 2011 13:42:21 -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 20/24] sys_swapon: simplify error flow in setup_swap_map_and_extents

Since there is no cleanup to do, there is no reason to jump to a label.
Return directly instead.

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 |   19 +++++--------------
 1 files changed, 5 insertions(+), 14 deletions(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 26eb84a..5f6df81 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1998,7 +1998,6 @@ static int setup_swap_map_and_extents(struct swap_info_struct *p,
 					sector_t *span)
 {
 	int i;
-	int error;
 	unsigned int nr_good_pages;
 	int nr_extents;
 
@@ -2006,10 +2005,8 @@ static int setup_swap_map_and_extents(struct swap_info_struct *p,
 
 	for (i = 0; i < swap_header->info.nr_badpages; i++) {
 		unsigned int page_nr = swap_header->info.badpages[i];
-		if (page_nr == 0 || page_nr > swap_header->info.last_page) {
-			error = -EINVAL;
-			goto bad_swap;
-		}
+		if (page_nr == 0 || page_nr > swap_header->info.last_page)
+			return -EINVAL;
 		if (page_nr < maxpages) {
 			swap_map[page_nr] = SWAP_MAP_BAD;
 			nr_good_pages--;
@@ -2021,22 +2018,16 @@ static int setup_swap_map_and_extents(struct swap_info_struct *p,
 		p->max = maxpages;
 		p->pages = nr_good_pages;
 		nr_extents = setup_swap_extents(p, span);
-		if (nr_extents < 0) {
-			error = nr_extents;
-			goto bad_swap;
-		}
+		if (nr_extents < 0)
+			return nr_extents;
 		nr_good_pages = p->pages;
 	}
 	if (!nr_good_pages) {
 		printk(KERN_WARNING "Empty swap-file\n");
-		error = -EINVAL;
-		goto bad_swap;
+		return -EINVAL;
 	}
 
 	return nr_extents;
-
-bad_swap:
-	return error;
 }
 
 SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
-- 
1.7.4

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