[PATCH] fix swsusp on machines not supporting S4

From: Pavel Machek (pavel_at_ucw.cz)
Date: 11/29/05

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    Date:	Tue, 29 Nov 2005 16:08:02 +0100
To: Andrew Morton <akpm@osdl.org>, Len Brown <len.brown@intel.com>, kernel list <linux-kernel@vger.kernel.org>, ACPI mailing list <acpi-devel@lists.sourceforge.net>

    Fix swsusp on machines not supporting S4. With recent changes, it is
    not possible to trigger it using /sys filesystem. Swsusp does not
    really need any support from low-level code, it is possible to reboot
    or halt at the end of suspend.

    Signed-off-by: Pavel Machek <pavel@suse.cz> 

    ---
commit 72936ce37893098af1e2ec30b95274ca721bbf82
tree 5b6aaf5cd5402bfc19b3faeab179c88803756805
parent 3248196034f5f0a93554b441bd41af2620afa635
author <pavel@amd.(none)> Tue, 29 Nov 2005 16:05:14 +0100
committer <pavel@amd.(none)> Tue, 29 Nov 2005 16:05:14 +0100
 kernel/power/main.c  |   21 ++++++++++++++++-----
 kernel/power/power.h |    3 ---
 2 files changed, 16 insertions(+), 8 deletions(-)
diff --git a/kernel/power/main.c b/kernel/power/main.c
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -24,7 +24,7 @@
 
 DECLARE_MUTEX(pm_sem);
 
-struct pm_ops * pm_ops = NULL;
+struct pm_ops *pm_ops = NULL;
 suspend_disk_method_t pm_disk_mode = PM_DISK_SHUTDOWN;
 
 /**
@@ -151,6 +151,18 @@ static char *pm_states[PM_SUSPEND_MAX] =
 #endif
 };
 
+static inline int valid_state(suspend_state_t state)
+{
+	/* Suspend-to-disk does not really need low-level support.
+	 * It can work with reboot if needed. */
+	if (state == PM_SUSPEND_DISK)
+		return 1;
+
+	if (pm_ops && pm_ops->valid && !pm_ops->valid(state))
+		return 0;
+	return 1;
+}
+
 
 /**
  *	enter_state - Do common work of entering low-power state.
@@ -167,7 +179,7 @@ static int enter_state(suspend_state_t s
 {
 	int error;
 
-	if (pm_ops && pm_ops->valid && !pm_ops->valid(state))
+	if (!valid_state(state))
 		return -ENODEV;
 	if (down_trylock(&pm_sem))
 		return -EBUSY;
@@ -238,9 +250,8 @@ static ssize_t state_show(struct subsyst
 	char * s = buf;
 
 	for (i = 0; i < PM_SUSPEND_MAX; i++) {
-		if (pm_states[i] && pm_ops && (!pm_ops->valid
-			||(pm_ops->valid && pm_ops->valid(i))))
-			s += sprintf(s,"%s ",pm_states[i]);
+		if (pm_states[i] && valid_state(i))
+			s += sprintf(s,"%s ", pm_states[i]);
 	}
 	s += sprintf(s,"\n");
 	return (s - buf);
-- 
Thanks, Sharp!
-
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