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path: root/drivers/acpi/scan.c
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Diffstat (limited to 'drivers/acpi/scan.c')
-rw-r--r--drivers/acpi/scan.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 954bd01f295a..2c4cac576a7e 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1400,10 +1400,10 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
void *context, void **return_value)
{
struct acpi_bus_ops *ops = context;
- struct acpi_device *device = NULL;
- acpi_status status;
int type;
unsigned long long sta;
+ struct acpi_device *device;
+ acpi_status status;
int result;
result = acpi_bus_type_and_status(handle, &type, &sta);
@@ -1414,13 +1414,16 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
!(sta & ACPI_STA_DEVICE_FUNCTIONING))
return AE_CTRL_DEPTH;
- if (ops->acpi_op_add)
- status = acpi_add_single_object(&device, handle, type, sta,
- ops);
- else
- status = acpi_bus_get_device(handle, &device);
+ /*
+ * We may already have an acpi_device from a previous enumeration. If
+ * so, we needn't add it again, but we may still have to start it.
+ */
+ device = NULL;
+ acpi_bus_get_device(handle, &device);
+ if (ops->acpi_op_add && !device)
+ acpi_add_single_object(&device, handle, type, sta, ops);
- if (ACPI_FAILURE(status))
+ if (!device)
return AE_CTRL_DEPTH;
if (ops->acpi_op_start && !(ops->acpi_op_add)) {