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

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Message-Id: <200702231119.55158.rjw@sisk.pl>
Date:	Fri, 23 Feb 2007 11:19:53 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	paulmck@...ux.vnet.ibm.com, ego@...ibm.com, akpm@...l.org,
	mingo@...e.hu, vatsa@...ibm.com, dipankar@...ibm.com,
	venkatesh.pallipadi@...el.com, Pavel Machek <pavel@....cz>,
	"Aneesh Kumar" <aneesh.kumar@...il.com>
Subject: [RFC][PATCH 2/7] Freezer: Fix memory ordering in refrigerator

From: Oleg Nesterov <oleg@...sign.ru>

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

Signed-off-by: Oleg Nesterov <oleg@...sign.ru>
Acked-by: Pavel Machek <pavel@....cz>
Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 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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