linux-kernel - Re: [PATCH -mm] PM: Separate hibernation code from suspend code

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Date:	Sat, 5 May 2007 15:50:52 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH -mm] PM: Separate hibernation code from suspend code

On Saturday, 5 May 2007 14:27, Johannes Berg wrote:
> On Sat, 2007-05-05 at 14:21 +0200, Rafael J. Wysocki wrote:
> > 
> > Power off the system instead of halting it if the 'platform' mode of
> > hibernation
> > has been requested, but hibernation_ops is not set. 
> 
> Ehm, unless you made a mistake in the patch then that shouldn't be
> possible.

Hmm, right, but the patch is correct nevertheless. :-)

I see where the problem is.  hibernation_mode is 0 by default
(HIBERNATION_INVALID) and it's not changed to anything else later if
defaults are used.

Something like this is necessary, I think:

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

Make sure that hibernation_mode is set to a reasonable value by default.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 kernel/power/disk.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

Index: linux-2.6.21/kernel/power/disk.c
===================================================================
--- linux-2.6.21.orig/kernel/power/disk.c	2007-05-05 13:51:45.000000000 +0200
+++ linux-2.6.21/kernel/power/disk.c	2007-05-05 15:45:23.000000000 +0200
@@ -30,8 +30,6 @@ char resume_file[256] = CONFIG_PM_STD_PA
 dev_t swsusp_resume_device;
 sector_t swsusp_resume_block;
 
-static int hibernation_mode;
-
 enum {
 	HIBERNATION_INVALID,
 	HIBERNATION_PLATFORM,
@@ -45,6 +43,8 @@ enum {
 #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
 #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
 
+static int hibernation_mode = HIBERNATION_SHUTDOWN;
+
 struct hibernation_ops *hibernation_ops;
 
 /**
@@ -60,6 +60,9 @@ void hibernation_set_ops(struct hibernat
 	}
 	mutex_lock(&pm_mutex);
 	hibernation_ops = ops;
+	if (ops)
+		hibernation_mode = HIBERNATION_PLATFORM;
+
 	mutex_unlock(&pm_mutex);
 }
 
-
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