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ACPI: battery: asynchronous init

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The battery driver tends to take quite some time to initialize
(100ms-300ms is quite typical).
This patch initializes the batter driver asynchronously, so that other
things in the kernel can initialize in parallel to this 300 msec.

As part of this, the battery driver had to move to the back
of the ACPI init order (hence the Makefile change).
Without this move, the next ACPI driver would just block
on the ACPI/devicee layer semaphores until the battery driver was
done anyway, not gaining any boot time.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Arjan van de Ven 2009-01-10 14:19:05 -05:00 committed by Len Brown
parent 8e0ee43bc2
commit 0f66af5301
2 changed files with 12 additions and 5 deletions
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2
drivers/acpi/Makefile
View File

@ -37,7 +37,6 @@ obj-y += scan.o
# Keep EC driver first. Initialization of others depend on it.
obj-y += ec.o
obj-$(CONFIG_ACPI_AC) += ac.o
obj-$(CONFIG_ACPI_BATTERY) += battery.o
obj-$(CONFIG_ACPI_BUTTON) += button.o
obj-$(CONFIG_ACPI_FAN) += fan.o
obj-$(CONFIG_ACPI_DOCK) += dock.o
@ -57,5 +56,6 @@ obj-$(CONFIG_ACPI_DEBUG) += debug.o
obj-$(CONFIG_ACPI_NUMA) += numa.o
obj-$(CONFIG_ACPI_HOTPLUG_MEMORY) += acpi_memhotplug.o
obj-$(CONFIG_ACPI_PROCFS_POWER) += cm_sbs.o
obj-$(CONFIG_ACPI_BATTERY) += battery.o
obj-$(CONFIG_ACPI_SBS) += sbshc.o
obj-$(CONFIG_ACPI_SBS) += sbs.o

15
drivers/acpi/battery.c
View File

@ -30,6 +30,7 @@
#include <linux/init.h>
#include <linux/types.h>
#include <linux/jiffies.h>
#include <linux/async.h>
#ifdef CONFIG_ACPI_PROCFS_POWER
#include <linux/proc_fs.h>
@ -901,21 +902,27 @@ static struct acpi_driver acpi_battery_driver = {
},
};
static int __init acpi_battery_init(void)
static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
{
if (acpi_disabled)
return -ENODEV;
return;
#ifdef CONFIG_ACPI_PROCFS_POWER
acpi_battery_dir = acpi_lock_battery_dir();
if (!acpi_battery_dir)
return -ENODEV;
return;
#endif
if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
#ifdef CONFIG_ACPI_PROCFS_POWER
acpi_unlock_battery_dir(acpi_battery_dir);
#endif
return -ENODEV;
return;
}
return;
}
static int __init acpi_battery_init(void)
{
async_schedule(acpi_battery_init_async, NULL);
return 0;
}