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futex: fix init order 

When the futex init code fails to initialize the futex pseudo file system it
returns early without initializing the hash queues.  Should the boot succeed
then a futex syscall which tries to enqueue a waiter on the hashqueue will
crash due to the unitilialized plist heads.

Initialize the hash queues before the filesystem.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Lennert Buytenhek <buytenh@wantstofly.org>
Cc: Riku Voipio <riku.voipio@movial.fi>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Thomas Gleixner 2008-02-23 15:23:55 -08:00 committed by Linus Torvalds
parent 43fe105a5c
commit 3e4ab747ef
1 changed files with 7 additions and 5 deletions
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12
kernel/futex.c
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@ -2145,8 +2145,14 @@ static struct file_system_type futex_fs_type = {
static int __init init(void) static int __init init(void)
{ {
int i = register_filesystem(&futex_fs_type); int i;
for (i = 0; i < ARRAY_SIZE(futex_queues); i++) {
plist_head_init(&futex_queues[i].chain, &futex_queues[i].lock);
spin_lock_init(&futex_queues[i].lock);
}
i = register_filesystem(&futex_fs_type);
if (i) if (i)
return i; return i;
@ -2156,10 +2162,6 @@ static int __init init(void)
return PTR_ERR(futex_mnt); return PTR_ERR(futex_mnt);
} }
for (i = 0; i < ARRAY_SIZE(futex_queues); i++) {
plist_head_init(&futex_queues[i].chain, &futex_queues[i].lock);
spin_lock_init(&futex_queues[i].lock);
}
return 0; return 0;
} }
__initcall(init); __initcall(init);