[PATCH v2 5/5] platform/x86: wmi: Decouple WMI device removal from wmi_block_list

Armin Wolf
2023-10-20T21:10:47Z

Use device_for_each_child_reverse() to find and unregister WMI devices
belonging to a WMI bus device instead of iterating thru the entire
wmi_block_list.

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
---
drivers/platform/x86/wmi.c | 29 ++++++++++++++---------------
1 file changed, 14 insertions(+), 15 deletions(-)

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index 6b3b2fe464d2..5c27b4aa9690 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -1280,19 +1280,6 @@ static int wmi_add_device(struct platform_device *pdev, struct wmi_device *wdev)
return device_add(&wdev->dev);
}

-static void wmi_free_devices(struct acpi_device *device)
-{
- struct wmi_block *wblock, *next;
-
- /* Delete devices for all the GUIDs */
- list_for_each_entry_safe(wblock, next, &wmi_block_list, list) {
- if (wblock->acpi_device == device) {
- list_del(&wblock->list);
- device_unregister(&wblock->dev.dev);
- }
- }
-}
-
static bool guid_already_parsed_for_legacy(struct acpi_device *device, const guid_t *guid)
{
struct wmi_block *wblock;
@@ -1487,16 +1474,28 @@ static void acpi_wmi_notify_handler(acpi_handle handle, u32 event,
event, 0);
}

+static int wmi_remove_device(struct device *dev, void *data)
+{
+ struct wmi_block *wblock = dev_to_wblock(dev);
+
+ list_del(&wblock->list);
+ device_unregister(dev);
+
+ return 0;
+}
+
static void acpi_wmi_remove(struct platform_device *device)
{
struct acpi_device *acpi_device = ACPI_COMPANION(&device->dev);
+ struct device *wmi_bus_device = dev_get_drvdata(&device->dev);

acpi_remove_notify_handler(acpi_device->handle, ACPI_ALL_NOTIFY,
acpi_wmi_notify_handler);
acpi_remove_address_space_handler(acpi_device->handle,
ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler);
- wmi_free_devices(acpi_device);
- device_unregister(dev_get_drvdata(&device->dev));
+
+ device_for_each_child_reverse(wmi_bus_device, NULL, wmi_remove_device);
+ device_unregister(wmi_bus_device);
}

static int acpi_wmi_probe(struct platform_device *device)
--
2.39.2