Suspend-related patches for 2.6.27
ACPI PM: Add possibility to change suspend sequence
There are some systems out there that don't work correctly with
our current suspend/hibernation code ordering. Provide a workaround
for these systems allowing them to pass 'acpi_sleep=old_ordering' in
the kernel command line so that it will use the pre-ACPI 2.0 ("old")
suspend code ordering.
Unfortunately, this requires us to add a platform hook to the
resuming of devices for recovering the platform in case one of the
device drivers' .suspend() routines returns error code. Namely,
ACPI 1.0 specifies that _PTS should be called before suspending
devices, but _WAK still should be called before resuming them in
order to undo the changes made by _PTS. However, if there is an
error during suspending devices, they are automatically resumed
without returning control to the PM core, so the _WAK has to be
called from within device_resume() in that cases.
The patch also reorders and refactors the ACPI suspend/hibernation
code to avoid duplication as far as reasonably possible.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 41f7ce7..33adcf9 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -234,6 +234,9 @@
int acpi_check_mem_region(resource_size_t start, resource_size_t n,
const char *name);
+#ifdef CONFIG_PM_SLEEP
+void __init acpi_old_suspend_ordering(void);
+#endif /* CONFIG_PM_SLEEP */
#else /* CONFIG_ACPI */
static inline int early_acpi_boot_init(void)