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Subject[PATCHv2 17/24] sys_swapon: simplify error flow in read_swap_header
Date
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@cesarb.net>
Tested-by: Eric B Munson <emunson@mgebm.net>
Acked-by: Eric B Munson <emunson@mgebm.net>
---
mm/swapfile.c | 15 ++++++---------
1 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index a56e6fe..13c13bd 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1928,7 +1928,7 @@ static unsigned long read_swap_header(struct swap_info_struct *p,

if (memcmp("SWAPSPACE2", swap_header->magic.magic, 10)) {
printk(KERN_ERR "Unable to find swap-space signature\n");
- goto bad_swap;
+ return 0;
}

/* swap partition endianess hack... */
@@ -1944,7 +1944,7 @@ static unsigned long read_swap_header(struct swap_info_struct *p,
printk(KERN_WARNING
"Unable to handle swap header version %d\n",
swap_header->info.version);
- goto bad_swap;
+ return 0;
}

p->lowest_bit = 1;
@@ -1976,22 +1976,19 @@ static unsigned long read_swap_header(struct swap_info_struct *p,
p->highest_bit = maxpages - 1;

if (!maxpages)
- goto bad_swap;
+ return 0;
swapfilepages = i_size_read(inode) >> PAGE_SHIFT;
if (swapfilepages && maxpages > swapfilepages) {
printk(KERN_WARNING
"Swap area shorter than signature indicates\n");
- goto bad_swap;
+ return 0;
}
if (swap_header->info.nr_badpages && S_ISREG(inode->i_mode))
- goto bad_swap;
+ return 0;
if (swap_header->info.nr_badpages > MAX_SWAP_BADPAGES)
- goto bad_swap;
+ return 0;

return maxpages;
-
-bad_swap:
- return 0;
}

SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
--
1.7.4


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