[PATCH 08/10] platform/x86: toshiba_acpi: use device-managed for wwan_rfkill management

[Alexandru Ardelean]

This change converts the wwan_rfkill object to be free'd automatically when
the parent refcount goes to zero.
There are 2 cleanup operations required: rfkill_unregister() and
rfkill_destroy(). Since they don't have any devm_ variants, they are hooked
via devm_add_action_or_reset().

The main reason to do this is to enforce ordering on cleanup, when the
Toshiba ACPI device is cleaned up.

Signed-off-by: Alexandru Ardelean <aardel...@deviqon.com>
---
 drivers/platform/x86/toshiba_acpi.c | 40 ++++++++++++++++++++++-------
 1 file changed, 31 insertions(+), 9 deletions(-)

diff --git a/drivers/platform/x86/toshiba_acpi.c 
b/drivers/platform/x86/toshiba_acpi.c
index 12860ef60e4d..a1249f6dde9a 100644
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -2591,7 +2591,22 @@ static const struct rfkill_ops wwan_rfk_ops = {
        .poll = toshiba_acpi_wwan_poll,
 };
 
-static int toshiba_acpi_setup_wwan_rfkill(struct toshiba_acpi_dev *dev)
+static void toshiba_acpi_rfkill_destroy(void *data)
+{
+       struct rfkill *wwan_rfk = data;
+
+       rfkill_destroy(wwan_rfk);
+}
+
+static void toshiba_acpi_rfkill_unreg(void *data)
+{
+       struct rfkill *wwan_rfk = data;
+
+       rfkill_unregister(wwan_rfk);
+}
+
+static int toshiba_acpi_setup_wwan_rfkill(struct device *parent,
+                                         struct toshiba_acpi_dev *dev)
 {
        int ret = toshiba_wireless_status(dev);
 
@@ -2608,15 +2623,27 @@ static int toshiba_acpi_setup_wwan_rfkill(struct 
toshiba_acpi_dev *dev)
                return -ENOMEM;
        }
 
+       ret = devm_add_action_or_reset(parent, toshiba_acpi_rfkill_destroy,
+                                      dev->wwan_rfk);
+       if (ret)
+               return ret;
+
        rfkill_set_hw_state(dev->wwan_rfk, !dev->killswitch);
 
        ret = rfkill_register(dev->wwan_rfk);
        if (ret) {
                pr_err("Unable to register WWAN rfkill device\n");
-               rfkill_destroy(dev->wwan_rfk);
+               return ret;
        }
 
-       return ret;
+       ret = devm_add_action_or_reset(parent, toshiba_acpi_rfkill_unreg,
+                                      dev->wwan_rfk);
+       if (ret) {
+               dev->wwan_rfk = NULL;
+               return ret;
+       }
+
+       return 0;
 }
 
 /*
@@ -2996,11 +3023,6 @@ static int toshiba_acpi_remove(struct acpi_device 
*acpi_dev)
                sysfs_remove_group(&dev->acpi_dev->dev.kobj,
                                   &toshiba_attr_group);
 
-       if (dev->wwan_rfk) {
-               rfkill_unregister(dev->wwan_rfk);
-               rfkill_destroy(dev->wwan_rfk);
-       }
-
        return 0;
 }
 
@@ -3189,7 +3211,7 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev)
 
        toshiba_wwan_available(dev);
        if (dev->wwan_supported)
-               toshiba_acpi_setup_wwan_rfkill(dev);
+               toshiba_acpi_setup_wwan_rfkill(parent, dev);
 
        toshiba_cooling_method_available(dev);
 
-- 
2.30.2