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Subject[PATCH 2/2] xen/acpi: xen cpu hotplug minor updates
Date
From 195df2bf6174959baa025ccb249041bb53d6060a Mon Sep 17 00:00:00 2001
From: Liu Jinsong <jinsong.liu@intel.com>
Date: Sun, 17 Feb 2013 11:47:24 +0800
Subject: [PATCH 2/2] xen/acpi: xen cpu hotplug minor updates

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>
---
drivers/xen/xen-acpi-cpuhotplug.c | 34 ++++++++++++----------------------
1 files changed, 12 insertions(+), 22 deletions(-)

diff --git a/drivers/xen/xen-acpi-cpuhotplug.c b/drivers/xen/xen-acpi-cpuhotplug.c
index 7578279..18c742b 100644
--- a/drivers/xen/xen-acpi-cpuhotplug.c
+++ b/drivers/xen/xen-acpi-cpuhotplug.c
@@ -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)
--
1.7.1[unhandled content-type:application/octet-stream]
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