Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux
[linux-drm-fsl-dcu.git] / drivers / acpi / scan.c
index fdda49336560acd2b0eb766430a811d6d842bf0c..d1ecca2b641a97f541dfdb18f1358738025f3ba7 100644 (file)
@@ -83,19 +83,29 @@ acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, cha
 }
 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
 
-static void acpi_bus_hot_remove_device(void *context)
+/**
+ * acpi_bus_hot_remove_device: hot-remove a device and its children
+ * @context: struct acpi_eject_event pointer (freed in this func)
+ *
+ * Hot-remove a device and its children. This function frees up the
+ * memory space passed by arg context, so that the caller may call
+ * this function asynchronously through acpi_os_hotplug_execute().
+ */
+void acpi_bus_hot_remove_device(void *context)
 {
+       struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
        struct acpi_device *device;
-       acpi_handle handle = context;
+       acpi_handle handle = ej_event->handle;
        struct acpi_object_list arg_list;
        union acpi_object arg;
        acpi_status status = AE_OK;
+       u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
 
        if (acpi_bus_get_device(handle, &device))
-               return;
+               goto err_out;
 
        if (!device)
-               return;
+               goto err_out;
 
        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                "Hot-removing device %s...\n", dev_name(&device->dev)));
@@ -103,7 +113,7 @@ static void acpi_bus_hot_remove_device(void *context)
        if (acpi_bus_trim(device, 1)) {
                printk(KERN_ERR PREFIX
                                "Removing device failed\n");
-               return;
+               goto err_out;
        }
 
        /* power off device */
@@ -129,10 +139,21 @@ static void acpi_bus_hot_remove_device(void *context)
         * TBD: _EJD support.
         */
        status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
-       if (ACPI_FAILURE(status))
-               printk(KERN_WARNING PREFIX
-                               "Eject device failed\n");
+       if (ACPI_FAILURE(status)) {
+               if (status != AE_NOT_FOUND)
+                       printk(KERN_WARNING PREFIX
+                                       "Eject device failed\n");
+               goto err_out;
+       }
+
+       kfree(context);
+       return;
 
+err_out:
+       /* Inform firmware the hot-remove operation has completed w/ error */
+       (void) acpi_evaluate_hotplug_ost(handle,
+                               ej_event->event, ost_code, NULL);
+       kfree(context);
        return;
 }
 
@@ -144,6 +165,7 @@ acpi_eject_store(struct device *d, struct device_attribute *attr,
        acpi_status status;
        acpi_object_type type = 0;
        struct acpi_device *acpi_device = to_acpi_device(d);
+       struct acpi_eject_event *ej_event;
 
        if ((!count) || (buf[0] != '1')) {
                return -EINVAL;
@@ -160,7 +182,25 @@ acpi_eject_store(struct device *d, struct device_attribute *attr,
                goto err;
        }
 
-       acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
+       ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
+       if (!ej_event) {
+               ret = -ENOMEM;
+               goto err;
+       }
+
+       ej_event->handle = acpi_device->handle;
+       if (acpi_device->flags.eject_pending) {
+               /* event originated from ACPI eject notification */
+               ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
+               acpi_device->flags.eject_pending = 0;
+       } else {
+               /* event originated from user */
+               ej_event->event = ACPI_OST_EC_OSPM_EJECT;
+               (void) acpi_evaluate_hotplug_ost(ej_event->handle,
+                       ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
+       }
+
+       acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
 err:
        return ret;
 }