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SubjectRe: [PATCH 1/2] HID: do not call hid_set_drvdata(hdev, NULL) in drivers
On Mon, 12 Aug 2019 18:27:39 +0200 Benjamin Tissoires wrote:
> This is a common pattern in the HID drivers to reset the drvdata. Some
> do it properly, some do it only in case of failure.
>
> But, this is actually already handled by driver core, so there is no need
> to do it manually.
>
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

For hid-picolcd_core.c:
Acked-by: Bruno Prémont <bonbons@linux-vserver.org>

> ---
> drivers/hid/hid-cougar.c | 6 ++----
> drivers/hid/hid-gfrm.c | 7 -------
> drivers/hid/hid-lenovo.c | 2 --
> drivers/hid/hid-picolcd_core.c | 7 +------
> drivers/hid/hid-sensor-hub.c | 1 -
> 5 files changed, 3 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/hid/hid-cougar.c b/drivers/hid/hid-cougar.c
> index e0bb7b34f3a4..4ff3bc1d25e2 100644
> --- a/drivers/hid/hid-cougar.c
> +++ b/drivers/hid/hid-cougar.c
> @@ -207,7 +207,7 @@ static int cougar_probe(struct hid_device *hdev,
> error = hid_parse(hdev);
> if (error) {
> hid_err(hdev, "parse failed\n");
> - goto fail;
> + return error;
> }
>
> if (hdev->collection->usage == COUGAR_VENDOR_USAGE) {
> @@ -219,7 +219,7 @@ static int cougar_probe(struct hid_device *hdev,
> error = hid_hw_start(hdev, connect_mask);
> if (error) {
> hid_err(hdev, "hw start failed\n");
> - goto fail;
> + return error;
> }
>
> error = cougar_bind_shared_data(hdev, cougar);
> @@ -249,8 +249,6 @@ static int cougar_probe(struct hid_device *hdev,
>
> fail_stop_and_cleanup:
> hid_hw_stop(hdev);
> -fail:
> - hid_set_drvdata(hdev, NULL);
> return error;
> }
>
> diff --git a/drivers/hid/hid-gfrm.c b/drivers/hid/hid-gfrm.c
> index 86c317320bf2..699186ff2349 100644
> --- a/drivers/hid/hid-gfrm.c
> +++ b/drivers/hid/hid-gfrm.c
> @@ -123,12 +123,6 @@ static int gfrm_probe(struct hid_device *hdev, const struct hid_device_id *id)
> return ret;
> }
>
> -static void gfrm_remove(struct hid_device *hdev)
> -{
> - hid_hw_stop(hdev);
> - hid_set_drvdata(hdev, NULL);
> -}
> -
> static const struct hid_device_id gfrm_devices[] = {
> { HID_BLUETOOTH_DEVICE(0x58, 0x2000),
> .driver_data = GFRM100 },
> @@ -142,7 +136,6 @@ static struct hid_driver gfrm_driver = {
> .name = "gfrm",
> .id_table = gfrm_devices,
> .probe = gfrm_probe,
> - .remove = gfrm_remove,
> .input_mapping = gfrm_input_mapping,
> .raw_event = gfrm_raw_event,
> .input_configured = gfrm_input_configured,
> diff --git a/drivers/hid/hid-lenovo.c b/drivers/hid/hid-lenovo.c
> index 364bc7f11d9d..96fa2a2c2cd3 100644
> --- a/drivers/hid/hid-lenovo.c
> +++ b/drivers/hid/hid-lenovo.c
> @@ -866,8 +866,6 @@ static void lenovo_remove_tpkbd(struct hid_device *hdev)
>
> led_classdev_unregister(&data_pointer->led_micmute);
> led_classdev_unregister(&data_pointer->led_mute);
> -
> - hid_set_drvdata(hdev, NULL);
> }
>
> static void lenovo_remove_cptkbd(struct hid_device *hdev)
> diff --git a/drivers/hid/hid-picolcd_core.c b/drivers/hid/hid-picolcd_core.c
> index 5f7a39a5d4af..1b5c63241af0 100644
> --- a/drivers/hid/hid-picolcd_core.c
> +++ b/drivers/hid/hid-picolcd_core.c
> @@ -534,8 +534,7 @@ static int picolcd_probe(struct hid_device *hdev,
> data = kzalloc(sizeof(struct picolcd_data), GFP_KERNEL);
> if (data == NULL) {
> hid_err(hdev, "can't allocate space for Minibox PicoLCD device data\n");
> - error = -ENOMEM;
> - goto err_no_cleanup;
> + return -ENOMEM;
> }
>
> spin_lock_init(&data->lock);
> @@ -597,9 +596,6 @@ static int picolcd_probe(struct hid_device *hdev,
> hid_hw_stop(hdev);
> err_cleanup_data:
> kfree(data);
> -err_no_cleanup:
> - hid_set_drvdata(hdev, NULL);
> -
> return error;
> }
>
> @@ -635,7 +631,6 @@ static void picolcd_remove(struct hid_device *hdev)
> picolcd_exit_cir(data);
> picolcd_exit_keys(data);
>
> - hid_set_drvdata(hdev, NULL);
> mutex_destroy(&data->mutex);
> /* Finally, clean up the picolcd data itself */
> kfree(data);
> diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c
> index be92a6f79687..94c7398b5c27 100644
> --- a/drivers/hid/hid-sensor-hub.c
> +++ b/drivers/hid/hid-sensor-hub.c
> @@ -742,7 +742,6 @@ static void sensor_hub_remove(struct hid_device *hdev)
> }
> spin_unlock_irqrestore(&data->lock, flags);
> mfd_remove_devices(&hdev->dev);
> - hid_set_drvdata(hdev, NULL);
> mutex_destroy(&data->mutex);
> }
>

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