linux-kernel - Re: [PATCH 1/2] HID: do not call hid_set

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Date:   Mon, 12 Aug 2019 09:39:17 -0700
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Bruno Prémont <bonbons@...ux-vserver.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Ping Cheng <pinglinux@...il.com>,
        Jason Gerecke <jason.gerecke@...om.com>,
        Jiri Kosina <jikos@...nel.org>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] HID: do not call hid_set_drvdata(hdev, NULL) in
 drivers

On Mon, 2019-08-12 at 18:27 +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@...hat.com>
for hid-sensor-hub.c
 Acked-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>

> ---
>  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);
>  }
>