linux-kernel - [PATCH -mm 2/3] Freezer: Return int from freeze

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Date:	Sun, 27 May 2007 13:03:23 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Gautham R Shenoy <ego@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...sign.ru>, Pavel Machek <pavel@....cz>
Subject: [PATCH -mm 2/3] Freezer: Return int from freeze_processes

From: Rafael J. Wysocki <rjw@...k.pl>

Make try_to_freeze_tasks() and freeze_processes() return -EBUSY on failure
instead of the number of unfrozen tasks (none of the callers actually uses this
number).

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
Acked-by: Pavel Machek <pavel@....cz>
---
 kernel/power/process.c |   21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

Index: linux-2.6.22-rc2/kernel/power/process.c
===================================================================
--- linux-2.6.22-rc2.orig/kernel/power/process.c
+++ linux-2.6.22-rc2/kernel/power/process.c
@@ -105,7 +105,7 @@ static void cancel_freezing(struct task_
 	}
 }
 
-static unsigned int try_to_freeze_tasks(int freeze_user_space)
+static int try_to_freeze_tasks(int freeze_user_space)
 {
 	struct task_struct *g, *p;
 	unsigned long end_time;
@@ -175,28 +175,25 @@ static unsigned int try_to_freeze_tasks(
 		read_unlock(&tasklist_lock);
 	}
 
-	return todo;
+	return todo ? -EBUSY : 0;
 }
 
 /**
  *	freeze_processes - tell processes to enter the refrigerator
- *
- *	Returns 0 on success, or the number of processes that didn't freeze,
- *	although they were told to.
  */
 int freeze_processes(void)
 {
-	unsigned int nr_unfrozen;
+	int error;
 
 	printk("Stopping tasks ... ");
-	nr_unfrozen = try_to_freeze_tasks(FREEZER_USER_SPACE);
-	if (nr_unfrozen)
-		return nr_unfrozen;
+	error = try_to_freeze_tasks(FREEZER_USER_SPACE);
+	if (error)
+		return error;
 
 	sys_sync();
-	nr_unfrozen = try_to_freeze_tasks(FREEZER_KERNEL_THREADS);
-	if (nr_unfrozen)
-		return nr_unfrozen;
+	error = try_to_freeze_tasks(FREEZER_KERNEL_THREADS);
+	if (error)
+		return error;
 
 	printk("done.\n");
 	BUG_ON(in_atomic());

-
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