On Mon, 10 Jul 2006 14:37:53 -0400
"Brown, Len" <[email protected]> wrote:
> Dunno why acpi_lock_ac_dir() makes pavel's box fail w/ acpi=off.
a) Because acpi_ac_init() forgot to check acpi_disabled, so
acpi_ac_init() calls acpi_lock_ac_dir() even with acpi=off.
b) Because acpi_lock_ac_dir() is doing down() on an uninitialised
semaphore, which hangs.
The fix to b) is in your tree now.
The fix for a) is below.
From: Pavel Machek <[email protected]>
With acpi=off and acpi_ac/battery compiled into kernel, acpi breaks
boot. This fixes it.
Signed-off-by: Pavel Machek <[email protected]>
Cc: "Brown, Len" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
drivers/acpi/ac.c | 2 ++
drivers/acpi/battery.c | 3 +++
2 files changed, 5 insertions(+)
diff -puN drivers/acpi/ac.c~acpi-fix-boot-with-acpi=off drivers/acpi/ac.c
--- a/drivers/acpi/ac.c~acpi-fix-boot-with-acpi=off
+++ a/drivers/acpi/ac.c
@@ -285,6 +285,8 @@ static int __init acpi_ac_init(void)
{
int result;
+ if (acpi_disabled)
+ return -ENODEV;
acpi_ac_dir = acpi_lock_ac_dir();
if (!acpi_ac_dir)
diff -puN drivers/acpi/battery.c~acpi-fix-boot-with-acpi=off drivers/acpi/battery.c
--- a/drivers/acpi/battery.c~acpi-fix-boot-with-acpi=off
+++ a/drivers/acpi/battery.c
@@ -757,6 +757,9 @@ static int __init acpi_battery_init(void
{
int result;
+ if (acpi_disabled)
+ return -ENODEV;
+
acpi_battery_dir = acpi_lock_battery_dir();
if (!acpi_battery_dir)
return -ENODEV;
_
-
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