ACPI: video: Use devm action for video bus object cleanup

Introduce acpi_video_bus_free() for freeing video bus object memory
and reversing changes related to it made during ACPI video bus device
probe, modify acpi_video_bus_probe() to add acpi_video_bus_free() as
a devm action, and remove the code superseded by it from
acpi_video_bus_remove().

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://patch.msgid.link/3892168.MHq7AAxBmi@rafael.j.wysocki

diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c
index ca2bee96794677f259240823c85bcbca11b663b7..11dd00614f6b18ce39c7b68341f63e4bb2e4cf10 100644 (file)
--- a/drivers/acpi/acpi_video.c
+++ b/drivers/acpi/acpi_video.c
@@ -1953,6 +1953,14 @@ static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
        return 0;
 }
 
+static void acpi_video_bus_free(void *data)
+{
+       struct acpi_video_bus *video = data;
+
+       video->device->driver_data = NULL;
+       kfree(video);
+}
+
 static int duplicate_dev_check(struct device *sibling, void *data)
 {
        struct acpi_video_bus *video;
@@ -2005,6 +2013,10 @@ static int acpi_video_bus_probe(struct auxiliary_device *aux_dev,
        video->device = device;
        device->driver_data = video;
 
+       error = devm_add_action_or_reset(dev, acpi_video_bus_free, video);
+       if (error)
+               return error;
+
        /*
         * A hack to fix the duplicate name "VID" problem on T61 and the
         * duplicate name "VGA" problem on Pa 3553.
@@ -2022,7 +2034,7 @@ static int acpi_video_bus_probe(struct auxiliary_device *aux_dev,
        acpi_video_bus_find_cap(video);
        error = acpi_video_bus_check(video);
        if (error)
-               goto err_free_video;
+               return error;
 
        mutex_init(&video->device_list_lock);
        INIT_LIST_HEAD(&video->video_device_list);
@@ -2081,9 +2093,6 @@ err_del:
 err_put_video:
        acpi_video_bus_put_devices(video);
        kfree(video->attached_array);
-err_free_video:
-       kfree(video);
-       device->driver_data = NULL;
 
        return error;
 }
@@ -2104,9 +2113,6 @@ static void acpi_video_bus_remove(struct auxiliary_device *aux_dev)
        acpi_video_bus_unregister_backlight(video);
        acpi_video_bus_put_devices(video);
        kfree(video->attached_array);
-
-       kfree(video);
-       device->driver_data = NULL;
 }
 
 static int __init is_i740(struct pci_dev *dev)