[RFC][PATCH 2/7] Freezer: Fix memory ordering in refrigerator

[Rafael J. Wysocki]

From: Oleg Nesterov <[EMAIL PROTECTED]>

refrigerator() can miss a wakeup, "wait event" loop needs a proper memory
ordering.

Signed-off-by: Oleg Nesterov <[EMAIL PROTECTED]>
Acked-by: Pavel Machek <[EMAIL PROTECTED]>
Signed-off-by: Rafael J. Wysocki <[EMAIL PROTECTED]>
---
 kernel/power/process.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Index: linux-2.6.20-mm2/kernel/power/process.c
===================================================================
--- linux-2.6.20-mm2.orig/kernel/power/process.c
+++ linux-2.6.20-mm2/kernel/power/process.c
@@ -47,8 +47,10 @@ void refrigerator(void)
        recalc_sigpending(); /* We sent fake signal, clean it up */
        spin_unlock_irq(&current->sighand->siglock);
 
-       while (frozen(current)) {
-               current->state = TASK_UNINTERRUPTIBLE;
+       for (;;) {
+               set_current_state(TASK_UNINTERRUPTIBLE);
+               if (!frozen(current))
+                       break;
                schedule();
        }
        pr_debug("%s left refrigerator\n", current->comm);

-
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