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PM: ACPI and APM must not be enabled at the same time

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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>
This commit is contained in:
Len Brown
2007-12-13 17:38:03 -05:00
parent da8cadb31b
commit 9f9adecd2d
6 changed files with 17 additions and 22 deletions
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4
kernel/power/pm.c
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@@ -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 *data)
EXPORT_SYMBOL(pm_register);
EXPORT_SYMBOL(pm_send_all);
EXPORT_SYMBOL(pm_active);