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Subject[PATCH 1/2] acpi : cpu hot-remove returns error number when cpu_down() fails
Even if cpu_down() fails, acpi_processor_remove() continues to remove the cpu.
But in this case, it should return error number since some process may run on
the cpu. If the cpu has a running process and the cpu is turned the power off,
the system cannot work well.

Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>

---
drivers/acpi/processor_driver.c | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)
Index: linux-3.5-rc4/drivers/acpi/processor_driver.c
===================================================================
--- linux-3.5-rc4.orig/drivers/acpi/processor_driver.c 2012-06-25 04:53:04.000000000 +0900
+++ linux-3.5-rc4/drivers/acpi/processor_driver.c 2012-07-05 21:02:58.711285382 +0900
@@ -610,7 +610,7 @@ err_free_pr:
static int acpi_processor_remove(struct acpi_device *device, int type)
{
struct acpi_processor *pr = NULL;
-
+ int ret;

if (!device || !acpi_driver_data(device))
return -EINVAL;
@@ -621,8 +621,9 @@ static int acpi_processor_remove(struct
goto free;

if (type == ACPI_BUS_REMOVAL_EJECT) {
- if (acpi_processor_handle_eject(pr))
- return -EINVAL;
+ ret = acpi_processor_handle_eject(pr);
+ if (ret)
+ return ret;
}

acpi_processor_power_exit(pr, device);
@@ -841,12 +842,17 @@ static acpi_status acpi_processor_hotadd

static int acpi_processor_handle_eject(struct acpi_processor *pr)
{
- if (cpu_online(pr->id))
- cpu_down(pr->id);
+ int ret;
+
+ if (cpu_online(pr->id)) {
+ ret = cpu_down(pr->id);
+ if (ret)
+ return ret;
+ }

arch_unregister_cpu(pr->id);
acpi_unmap_lsapic(pr->id);
- return (0);
+ return ret;
}
#else
static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr)


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