From: William Lee Irwin III <wli@holomorphy.com>
Coz we can get wakeups from unexpected sources (eg: timers)
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/kernel/wait.c | 8 +++++---
1 files changed, 5 insertions(+), 3 deletions(-)
diff -puN kernel/wait.c~wait_on_bit-must-loop kernel/wait.c
--- 25/kernel/wait.c~wait_on_bit-must-loop 2004-09-21 01:57:14.000000000 -0700
+++ 25-akpm/kernel/wait.c 2004-09-21 03:07:03.769367736 -0700
@@ -156,9 +156,11 @@ __wait_on_bit(wait_queue_head_t *wq, str
{
int ret = 0;
- prepare_to_wait(wq, &q->wait, mode);
- if (test_bit(q->key.bit_nr, q->key.flags))
- ret = (*action)(q->key.flags);
+ do {
+ prepare_to_wait(wq, &q->wait, mode);
+ if (test_bit(q->key.bit_nr, q->key.flags))
+ ret = (*action)(q->key.flags);
+ } while (test_bit(q->key.bit_nr, q->key.flags) && !ret);
finish_wait(wq, &q->wait);
return ret;
}
_