Doing _WAK (from pm_finish) before device_resume will brake almost all
ACPI devices.
Regards,
Alex.
On 5/4/07, Rafael J. Wysocki <[EMAIL PROTECTED]> wrote:
Hi,
The change of the hibernation/suspend code ordering made before 2.6.21 has
caused some systems to have problems related to ACPI. In particular, the
'platform' hibernation mode doesn't work any more on some systems.
It has been confirmed that the appended patch fixes the problem, but it's not
certain if this changes don't break some other systems. For this reason, all
users of hibernation (swsusp, uswsusp) are gently requested to verify if this
patch doesn't break their systems.
Greetings,
Rafael
---
From: Rafael J. Wysocki <[EMAIL PROTECTED]>
The current code ordering in the hibernation code paths causes some systems to
have problems. It has been confirmed by testers that these problems do not
appear if the acpi_pm_finish() function (called via platform_finish()) is
executed after device_suspend().
Signed-off-by: Rafael J. Wysocki <[EMAIL PROTECTED]>
---
kernel/power/disk.c | 4 ++--
kernel/power/user.c | 8 ++++----
2 files changed, 6 insertions(+), 6 deletions(-)
Index: linux-2.6.21/kernel/power/disk.c
===================================================================
--- linux-2.6.21.orig/kernel/power/disk.c 2007-05-04 10:31:51.000000000
+0200
+++ linux-2.6.21/kernel/power/disk.c 2007-05-04 10:32:12.000000000 +0200
@@ -195,9 +195,9 @@ int hibernate(void)
if (in_suspend) {
enable_nonboot_cpus();
- platform_finish();
device_resume();
resume_console();
+ platform_finish();
pr_debug("PM: writing image.\n");
error = swsusp_write();
if (!error)
@@ -214,9 +214,9 @@ int hibernate(void)
Enable_cpus:
enable_nonboot_cpus();
Resume_devices:
- platform_finish();
device_resume();
resume_console();
+ platform_finish();
Thaw:
mutex_unlock(&pm_mutex);
unprepare_processes();
Index: linux-2.6.21/kernel/power/user.c
===================================================================
--- linux-2.6.21.orig/kernel/power/user.c 2007-05-04 10:31:51.000000000
+0200
+++ linux-2.6.21/kernel/power/user.c 2007-05-04 10:32:12.000000000 +0200
@@ -169,11 +169,11 @@ static inline int snapshot_suspend(int p
}
enable_nonboot_cpus();
Resume_devices:
+ device_resume();
+ resume_console();
if (platform_suspend)
platform_finish();
- device_resume();
- resume_console();
Finish:
mutex_unlock(&pm_mutex);
return error;
@@ -201,11 +201,11 @@ static inline int snapshot_restore(int p
enable_nonboot_cpus();
Resume_devices:
+ device_resume();
+ resume_console();
if (platform_suspend)
platform_finish();
- device_resume();
- resume_console();
Finish:
pm_restore_console();
mutex_unlock(&pm_mutex);
_______________________________________________
linux-pm mailing list
[EMAIL PROTECTED]
https://lists.linux-foundation.org/mailman/listinfo/linux-pm
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
