linux-kernel - [PATCH v3 3/3] HID: nvidia-shield: Introduce thunderstrike

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Message-Id: <20230918115432.30076-4-rrameshbabu@nvidia.com>
Date:   Mon, 18 Sep 2023 04:54:32 -0700
From:   Rahul Rameshbabu <rrameshbabu@...dia.com>
To:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        kernel-janitors@...r.kernel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Rahul Rameshbabu <rrameshbabu@...dia.com>
Subject: [PATCH v3 3/3] HID: nvidia-shield: Introduce thunderstrike_destroy()

From: Christophe JAILLET <christophe.jaillet@...adoo.fr>

In order to simplify some error handling paths and avoid code duplication,
introduce thunderstrike_destroy() which undoes thunderstrike_create().

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Reviewed-by: Rahul Rameshbabu <rrameshbabu@...dia.com>
---

Notes:
    Changes:
    
      v1->v2:
        - Re-order operations in thunderstrike_destroy to be in LIFO order with
          regards to the operations in thunderstrike_create.
      v2->v3:
        - Refactor thunderstrike_destroy to take a thunderstrike instance
          pointer as a parameter and prevent a variable from being unused
          in shield_probe.

 drivers/hid/hid-nvidia-shield.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/hid/hid-nvidia-shield.c b/drivers/hid/hid-nvidia-shield.c
index a566f9cdc97d..bc47e19ef117 100644
--- a/drivers/hid/hid-nvidia-shield.c
+++ b/drivers/hid/hid-nvidia-shield.c
@@ -915,6 +915,15 @@ static struct shield_device *thunderstrike_create(struct hid_device *hdev)
 	return ERR_PTR(ret);
 }
 
+static void thunderstrike_destroy(struct thunderstrike *ts)
+{
+	led_classdev_unregister(&ts->led_dev);
+	power_supply_unregister(ts->base.battery_dev.psy);
+	if (ts->haptics_dev)
+		input_unregister_device(ts->haptics_dev);
+	ida_free(&thunderstrike_ida, ts->id);
+}
+
 static int android_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 				 struct hid_field *field,
 				 struct hid_usage *usage, unsigned long **bit,
@@ -1074,11 +1083,7 @@ static int shield_probe(struct hid_device *hdev, const struct hid_device_id *id)
 err_stop:
 	hid_hw_stop(hdev);
 err_ts_create:
-	power_supply_unregister(ts->base.battery_dev.psy);
-	if (ts->haptics_dev)
-		input_unregister_device(ts->haptics_dev);
-	led_classdev_unregister(&ts->led_dev);
-	ida_free(&thunderstrike_ida, ts->id);
+	thunderstrike_destroy(ts);
 	return ret;
 }
 
@@ -1090,11 +1095,7 @@ static void shield_remove(struct hid_device *hdev)
 	ts = container_of(dev, struct thunderstrike, base);
 
 	hid_hw_close(hdev);
-	power_supply_unregister(dev->battery_dev.psy);
-	if (ts->haptics_dev)
-		input_unregister_device(ts->haptics_dev);
-	led_classdev_unregister(&ts->led_dev);
-	ida_free(&thunderstrike_ida, ts->id);
+	thunderstrike_destroy(ts);
 	del_timer_sync(&ts->psy_stats_timer);
 	cancel_work_sync(&ts->hostcmd_req_work);
 	hid_hw_stop(hdev);
-- 
2.40.1