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path: root/drivers/acpi/acpi_memhotplug.c
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Diffstat (limited to 'drivers/acpi/acpi_memhotplug.c')
-rw-r--r--drivers/acpi/acpi_memhotplug.c82
1 files changed, 44 insertions, 38 deletions
diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index b679bf8478f7..034d3e72aa92 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -54,7 +54,7 @@ MODULE_LICENSE("GPL");
#define MEMORY_POWER_OFF_STATE 2
static int acpi_memory_device_add(struct acpi_device *device);
-static int acpi_memory_device_remove(struct acpi_device *device, int type);
+static int acpi_memory_device_remove(struct acpi_device *device);
static const struct acpi_device_id memory_device_ids[] = {
{ACPI_MEMORY_DEVICE_HID, 0},
@@ -153,51 +153,46 @@ acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
return 0;
}
-static int
-acpi_memory_get_device(acpi_handle handle,
- struct acpi_memory_device **mem_device)
+static int acpi_memory_get_device(acpi_handle handle,
+ struct acpi_memory_device **mem_device)
{
- acpi_status status;
- acpi_handle phandle;
struct acpi_device *device = NULL;
- struct acpi_device *pdevice = NULL;
- int result;
+ int result = 0;
+ acpi_scan_lock_acquire();
- if (!acpi_bus_get_device(handle, &device) && device)
+ acpi_bus_get_device(handle, &device);
+ if (device)
goto end;
- status = acpi_get_parent(handle, &phandle);
- if (ACPI_FAILURE(status)) {
- ACPI_EXCEPTION((AE_INFO, status, "Cannot find acpi parent"));
- return -EINVAL;
- }
-
- /* Get the parent device */
- result = acpi_bus_get_device(phandle, &pdevice);
- if (result) {
- acpi_handle_warn(phandle, "Cannot get acpi bus device\n");
- return -EINVAL;
- }
-
/*
* Now add the notified device. This creates the acpi_device
* and invokes .add function
*/
- result = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE);
+ result = acpi_bus_scan(handle);
if (result) {
- acpi_handle_warn(handle, "Cannot add acpi bus\n");
- return -EINVAL;
+ acpi_handle_warn(handle, "ACPI namespace scan failed\n");
+ result = -EINVAL;
+ goto out;
+ }
+ result = acpi_bus_get_device(handle, &device);
+ if (result) {
+ acpi_handle_warn(handle, "Missing device object\n");
+ result = -EINVAL;
+ goto out;
}
- end:
+ end:
*mem_device = acpi_driver_data(device);
if (!(*mem_device)) {
dev_err(&device->dev, "driver data not found\n");
- return -ENODEV;
+ result = -ENODEV;
+ goto out;
}
- return 0;
+ out:
+ acpi_scan_lock_release();
+ return result;
}
static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
@@ -317,6 +312,7 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
struct acpi_device *device;
struct acpi_eject_event *ej_event = NULL;
u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
+ acpi_status status;
switch (event) {
case ACPI_NOTIFY_BUS_CHECK:
@@ -339,29 +335,40 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"\nReceived EJECT REQUEST notification for device\n"));
+ status = AE_ERROR;
+ acpi_scan_lock_acquire();
+
if (acpi_bus_get_device(handle, &device)) {
acpi_handle_err(handle, "Device doesn't exist\n");
- break;
+ goto unlock;
}
mem_device = acpi_driver_data(device);
if (!mem_device) {
acpi_handle_err(handle, "Driver Data is NULL\n");
- break;
+ goto unlock;
}
ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
if (!ej_event) {
pr_err(PREFIX "No memory, dropping EJECT\n");
- break;
+ goto unlock;
}
- ej_event->handle = handle;
+ get_device(&device->dev);
+ ej_event->device = device;
ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
- acpi_os_hotplug_execute(acpi_bus_hot_remove_device,
- (void *)ej_event);
+ /* The eject is carried out asynchronously. */
+ status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device,
+ ej_event);
+ if (ACPI_FAILURE(status)) {
+ put_device(&device->dev);
+ kfree(ej_event);
+ }
- /* eject is performed asynchronously */
- return;
+ unlock:
+ acpi_scan_lock_release();
+ if (ACPI_SUCCESS(status))
+ return;
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Unsupported event [0x%x]\n", event));
@@ -372,7 +379,6 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
/* Inform firmware that the hotplug operation has completed */
(void) acpi_evaluate_hotplug_ost(handle, event, ost_code, NULL);
- return;
}
static void acpi_memory_device_free(struct acpi_memory_device *mem_device)
@@ -427,7 +433,7 @@ static int acpi_memory_device_add(struct acpi_device *device)
return result;
}
-static int acpi_memory_device_remove(struct acpi_device *device, int type)
+static int acpi_memory_device_remove(struct acpi_device *device)
{
struct acpi_memory_device *mem_device = NULL;
int result;