[PATCH 07/27] HID: wacom: switch inputs to devres

[Benjamin Tissoires]

Simplifying the error code paths.
We need to keep wacom_clean_inputs() around for now as the wireless
module is using it to dynamically remove the inputs on disconnect.

Signed-off-by: Benjamin Tissoires <benjamin.tissoi...@redhat.com>
---
 drivers/hid/wacom_sys.c | 34 ++++++++++++++++------------------
 1 file changed, 16 insertions(+), 18 deletions(-)

diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index 61dcb87e..da2fccf 100644
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -91,7 +91,12 @@ static void wacom_close(struct input_dev *dev)
 {
        struct wacom *wacom = input_get_drvdata(dev);
 
-       hid_hw_close(wacom->hdev);
+       /*
+        * wacom->hdev should never be null, but surprisingly, I had the case
+        * once while unplugging the Wacom Wireless Receiver.
+        */
+       if (wacom->hdev)
+               hid_hw_close(wacom->hdev);
 }
 
 /*
@@ -1370,7 +1375,7 @@ static struct input_dev *wacom_allocate_input(struct 
wacom *wacom)
        struct hid_device *hdev = wacom->hdev;
        struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
 
-       input_dev = input_allocate_device();
+       input_dev = devm_input_allocate_device(&hdev->dev);
        if (!input_dev)
                return NULL;
 
@@ -1424,10 +1429,10 @@ static int wacom_allocate_inputs(struct wacom *wacom)
        wacom_wac->pen_input = wacom_allocate_input(wacom);
        wacom_wac->touch_input = wacom_allocate_input(wacom);
        wacom_wac->pad_input = wacom_allocate_input(wacom);
-       if (!wacom_wac->pen_input || !wacom_wac->touch_input || 
!wacom_wac->pad_input) {
-               wacom_clean_inputs(wacom);
+       if (!wacom_wac->pen_input ||
+           !wacom_wac->touch_input ||
+           !wacom_wac->pad_input)
                return -ENOMEM;
-       }
 
        wacom_wac->pen_input->name = wacom_wac->pen_name;
        wacom_wac->touch_input->name = wacom_wac->touch_name;
@@ -1458,7 +1463,7 @@ static int wacom_register_inputs(struct wacom *wacom)
        } else {
                error = input_register_device(pen_input_dev);
                if (error)
-                       goto fail_register_pen_input;
+                       goto fail;
                wacom_wac->pen_registered = true;
        }
 
@@ -1471,7 +1476,7 @@ static int wacom_register_inputs(struct wacom *wacom)
        } else {
                error = input_register_device(touch_input_dev);
                if (error)
-                       goto fail_register_touch_input;
+                       goto fail;
                wacom_wac->touch_registered = true;
        }
 
@@ -1484,23 +1489,19 @@ static int wacom_register_inputs(struct wacom *wacom)
        } else {
                error = input_register_device(pad_input_dev);
                if (error)
-                       goto fail_register_pad_input;
+                       goto fail;
                wacom_wac->pad_registered = true;
        }
 
        return 0;
 
-fail_register_pad_input:
-       if (touch_input_dev)
-               input_unregister_device(touch_input_dev);
+fail:
+       wacom_wac->pad_input = NULL;
+       wacom_wac->pad_registered = false;
        wacom_wac->touch_input = NULL;
        wacom_wac->touch_registered = false;
-fail_register_touch_input:
-       if (pen_input_dev)
-               input_unregister_device(pen_input_dev);
        wacom_wac->pen_input = NULL;
        wacom_wac->pen_registered = false;
-fail_register_pen_input:
        return error;
 }
 
@@ -1741,14 +1742,12 @@ fail_hw_start:
 fail_remote:
        wacom_destroy_leds(wacom);
 fail_leds:
-       wacom_clean_inputs(wacom);
 fail_register_inputs:
 fail_battery:
        wacom_remove_shared_data(wacom);
 fail_shared_data:
 fail_parsed:
 fail_allocate_inputs:
-       wacom_clean_inputs(wacom);
        return error;
 }
 
@@ -1928,7 +1927,6 @@ static void wacom_remove(struct hid_device *hdev)
        cancel_work_sync(&wacom->battery_work);
        kobject_put(wacom->remote_dir);
        wacom_destroy_leds(wacom);
-       wacom_clean_inputs(wacom);
        if (hdev->bus == BUS_BLUETOOTH)
                device_remove_file(&hdev->dev, &dev_attr_speed);
        wacom_remove_shared_data(wacom);
-- 
2.5.5