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>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

1 files changed, 12 insertions, 22 deletions

diff --git a/drivers/xen/xen-acpi-cpuhotplug.c b/drivers/xen/xen-acpi-cpuhotplug.c
index 757827966e34..18c742bec91b 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)