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[PATCH] pi-futex: futex_wake() lockup fix

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Fix futex_wake() exit condition bug when handling the robust-list with PI
futexes on them.

(reported by Ulrich Drepper, debugged by the lock validator.)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Ulrich Drepper <drepper@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar 2006-07-01 04:35:46 -07:00 committed by Linus Torvalds
parent a99e4e413e
commit ed6f7b10e6
1 changed files with 4 additions and 2 deletions
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6
kernel/futex.c
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@ -630,8 +630,10 @@ static int futex_wake(u32 __user *uaddr, int nr_wake)
list_for_each_entry_safe(this, next, head, list) { list_for_each_entry_safe(this, next, head, list) {
if (match_futex (&this->key, &key)) { if (match_futex (&this->key, &key)) {
if (this->pi_state) if (this->pi_state) {
return -EINVAL; ret = -EINVAL;
break;
}
wake_futex(this); wake_futex(this);
if (++ret >= nr_wake) if (++ret >= nr_wake)
break; break;