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xen/acpi: xen cpu hotplug minor updates

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Recently at native Rafael did some cleanup for acpi, say, drop
acpi_bus_add, remove unnecessary argument of acpi_bus_scan,
and run acpi_bus_scan under acpi_scan_lock.

This patch does similar cleanup for xen cpu hotplug, removing
redundant logic, and adding lock.

Signed-off-by: Liu Jinsong <jinsong.liu@intel.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Liu Jinsong 2013-02-17 11:47:24 +08:00 committed by Konrad Rzeszutek Wilk
parent 484400ffbf
commit 1b37d6ea2c
1 changed files with 12 additions and 22 deletions
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34
drivers/xen/xen-acpi-cpuhotplug.c
View file

@ -239,24 +239,6 @@ static acpi_status xen_acpi_cpu_hotadd(struct acpi_processor *pr)
return AE_OK;
}
static
int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
{
acpi_handle phandle;
struct acpi_device *pdev;
if (acpi_get_parent(handle, &phandle))
return -ENODEV;
if (acpi_bus_get_device(phandle, &pdev))
return -ENODEV;
if (acpi_bus_scan(handle))
return -ENODEV;
return 0;
}
static int acpi_processor_device_remove(struct acpi_device *device)
{
pr_debug(PREFIX "Xen does not support CPU hotremove\n");
@ -272,6 +254,8 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
int result;
acpi_scan_lock_acquire();
switch (event) {
case ACPI_NOTIFY_BUS_CHECK:
case ACPI_NOTIFY_DEVICE_CHECK:
@ -286,12 +270,16 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
if (!acpi_bus_get_device(handle, &device))
break;
result = acpi_processor_device_add(handle, &device);
result = acpi_bus_scan(handle);
if (result) {
pr_err(PREFIX "Unable to add the device\n");
break;
}
result = acpi_bus_get_device(handle, &device);
if (result) {
pr_err(PREFIX "Missing device object\n");
break;
}
ost_code = ACPI_OST_SC_SUCCESS;
break;
@ -321,11 +309,13 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
"Unsupported event [0x%x]\n", event));
/* non-hotplug event; possibly handled by other handler */
return;
goto out;
}
(void) acpi_evaluate_hotplug_ost(handle, event, ost_code, NULL);
return;
out:
acpi_scan_lock_release();
}
static acpi_status is_processor_device(acpi_handle handle)