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Subject[patch 37/73] PM: ACPI and APM must not be enabled at the same time
2.6.23-stable review patch.  If anyone has any objections, please let us know.
------------------
From: Len Brown <len.brown@intel.com>

patch 9f9adecd2d0e4f88fa0e8cb06c6ec207748df70a in mainline.

ACPI and APM used "pm_active" to guarantee that
they would not be simultaneously active.

But pm_active was recently moved under CONFIG_PM_LEGACY,
so that without CONFIG_PM_LEGACY, pm_active became a NOP --
allowing ACPI and APM to both be simultaneously enabled.
This caused unpredictable results, including boot hangs.

Further, the code under CONFIG_PM_LEGACY is scheduled
for removal.

So replace pm_active with pm_flags.
pm_flags depends only on CONFIG_PM,
which is present for both CONFIG_APM and CONFIG_ACPI.

http://bugzilla.kernel.org/show_bug.cgi?id=9194

Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
arch/i386/kernel/apm.c | 10 +++-------
drivers/acpi/bus.c | 7 ++-----
include/linux/pm.h | 9 +++++++++
include/linux/pm_legacy.h | 6 ------
kernel/power/main.c | 3 +++
kernel/power/pm.c | 4 ----
6 files changed, 17 insertions(+), 22 deletions(-)

--- a/arch/i386/kernel/apm.c
+++ b/arch/i386/kernel/apm.c
@@ -2256,14 +2256,12 @@ static int __init apm_init(void)
apm_info.disabled = 1;
return -ENODEV;
}
- if (PM_IS_ACTIVE()) {
+ if (pm_flags & PM_ACPI) {
printk(KERN_NOTICE "apm: overridden by ACPI.\n");
apm_info.disabled = 1;
return -ENODEV;
}
-#ifdef CONFIG_PM_LEGACY
- pm_active = 1;
-#endif
+ pm_flags |= PM_APM;

/*
* Set up a segment that references the real mode segment 0x40
@@ -2366,9 +2364,7 @@ static void __exit apm_exit(void)
kthread_stop(kapmd_task);
kapmd_task = NULL;
}
-#ifdef CONFIG_PM_LEGACY
- pm_active = 0;
-#endif
+ pm_flags &= ~PM_APM;
}

module_init(apm_init);
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -29,7 +29,6 @@
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/pm.h>
-#include <linux/pm_legacy.h>
#include <linux/device.h>
#include <linux/proc_fs.h>
#ifdef CONFIG_X86
@@ -757,16 +756,14 @@ static int __init acpi_init(void)
result = acpi_bus_init();

if (!result) {
-#ifdef CONFIG_PM_LEGACY
- if (!PM_IS_ACTIVE())
- pm_active = 1;
+ if (!(pm_flags & PM_APM))
+ pm_flags |= PM_ACPI;
else {
printk(KERN_INFO PREFIX
"APM is already active, exiting\n");
disable_acpi();
result = -ENODEV;
}
-#endif
} else
disable_acpi();

--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -344,6 +344,15 @@ static inline int call_platform_enable_w
device_set_wakeup_enable(dev,val); \
} while(0)

+/*
+ * Global Power Management flags
+ * Used to keep APM and ACPI from both being active
+ */
+extern unsigned int pm_flags;
+
+#define PM_APM 1
+#define PM_ACPI 2
+
#endif /* __KERNEL__ */

#endif /* _LINUX_PM_H */
--- a/include/linux/pm_legacy.h
+++ b/include/linux/pm_legacy.h
@@ -4,10 +4,6 @@

#ifdef CONFIG_PM_LEGACY

-extern int pm_active;
-
-#define PM_IS_ACTIVE() (pm_active != 0)
-
/*
* Register a device with power management
*/
@@ -21,8 +17,6 @@ int __deprecated pm_send_all(pm_request_

#else /* CONFIG_PM_LEGACY */

-#define PM_IS_ACTIVE() 0
-
static inline struct pm_dev *pm_register(pm_dev_t type,
unsigned long id,
pm_callback callback)
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -27,6 +27,9 @@ BLOCKING_NOTIFIER_HEAD(pm_chain_head);

DEFINE_MUTEX(pm_mutex);

+unsigned int pm_flags;
+EXPORT_SYMBOL(pm_flags);
+
#ifdef CONFIG_SUSPEND

/* This is just an arbitrary number */
--- a/kernel/power/pm.c
+++ b/kernel/power/pm.c
@@ -27,8 +27,6 @@
#include <linux/interrupt.h>
#include <linux/mutex.h>

-int pm_active;
-
/*
* Locking notes:
* pm_devs_lock can be a semaphore providing pm ops are not called
@@ -204,6 +202,4 @@ int pm_send_all(pm_request_t rqst, void

EXPORT_SYMBOL(pm_register);
EXPORT_SYMBOL(pm_send_all);
-EXPORT_SYMBOL(pm_active);
-

--


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