platform/x86: intel-vbtn: Switch to use devm_input_allocate_device

Use devm_input_allocate_device to simplify the error handling code.
This conversion also makes input_register_device() to be called after
acpi_remove_notify_handler. This avoid a small window that it's possible
to call notify_handler after unregister input device.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

diff --git a/drivers/platform/x86/intel-vbtn.c b/drivers/platform/x86/intel-vbtn.c
index f04a394d52d6d2e3443a6f549f477530174b7876..bd7230a89f15b8b523c5ee0436517ec6ec582702 100644 (file)
--- a/drivers/platform/x86/intel-vbtn.c
+++ b/drivers/platform/x86/intel-vbtn.c
@@ -49,34 +49,19 @@ static int intel_vbtn_input_setup(struct platform_device *device)
        struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);
        int ret;
 
-       priv->input_dev = input_allocate_device();
+       priv->input_dev = devm_input_allocate_device(&device->dev);
        if (!priv->input_dev)
                return -ENOMEM;
 
        ret = sparse_keymap_setup(priv->input_dev, intel_vbtn_keymap, NULL);
        if (ret)
-               goto err_free_device;
+               return ret;
 
        priv->input_dev->dev.parent = &device->dev;
        priv->input_dev->name = "Intel Virtual Button driver";
        priv->input_dev->id.bustype = BUS_HOST;
 
-       ret = input_register_device(priv->input_dev);
-       if (ret)
-               goto err_free_device;
-
-       return 0;
-
-err_free_device:
-       input_free_device(priv->input_dev);
-       return ret;
-}
-
-static void intel_vbtn_input_destroy(struct platform_device *device)
-{
-       struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);
-
-       input_unregister_device(priv->input_dev);
+       return input_register_device(priv->input_dev);
 }
 
 static void notify_handler(acpi_handle handle, u32 event, void *context)
@@ -117,24 +102,16 @@ static int intel_vbtn_probe(struct platform_device *device)
                                             ACPI_DEVICE_NOTIFY,
                                             notify_handler,
                                             device);
-       if (ACPI_FAILURE(status)) {
-               err = -EBUSY;
-               goto err_remove_input;
-       }
+       if (ACPI_FAILURE(status))
+               return -EBUSY;
 
        return 0;
-
-err_remove_input:
-       intel_vbtn_input_destroy(device);
-
-       return err;
 }
 
 static int intel_vbtn_remove(struct platform_device *device)
 {
        acpi_handle handle = ACPI_HANDLE(&device->dev);
 
-       intel_vbtn_input_destroy(device);
        acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
 
        /*