linux-kernel - Re: [PATCH 2/2] Input: wacom_i2c - switch to using managed resources

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Date:   Mon, 22 Mar 2021 09:14:57 -0400
From:   Alistair <alistair@...stair23.me>
To:     "Dmitry Torokhov" <dmitry.torokhov@...il.com>,
        linux-input@...r.kernel.org
Cc:     "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] Input: wacom_i2c - switch to using managed resources

On Sun, Mar 21, 2021, at 6:00 PM, Dmitry Torokhov wrote:
> This simplifies error unwinding path and allows us to get rid of
> remove() method.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com <mailto:dmitry.torokhov%40gmail.com>>

Reviewed-by: Alistair Francis <alistair@...stair23.me>

Alistair

> ---
> drivers/input/touchscreen/wacom_i2c.c | 55 +++++++++------------------
> 1 file changed, 17 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/wacom_i2c.c b/drivers/input/touchscreen/wacom_i2c.c
> index 609ff84e7693..22826c387da5 100644
> --- a/drivers/input/touchscreen/wacom_i2c.c
> +++ b/drivers/input/touchscreen/wacom_i2c.c
> @@ -145,15 +145,16 @@ static void wacom_i2c_close(struct input_dev *dev)
> }
>  
> static int wacom_i2c_probe(struct i2c_client *client,
> -      const struct i2c_device_id *id)
> +    const struct i2c_device_id *id)
> {
> + struct device *dev = &client->dev;
> struct wacom_i2c *wac_i2c;
> struct input_dev *input;
> struct wacom_features features = { 0 };
> int error;
>  
> if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
> - dev_err(&client->dev, "i2c_check_functionality error\n");
> + dev_err(dev, "i2c_check_functionality error\n");
> return -EIO;
> }
>  
> @@ -161,21 +162,22 @@ static int wacom_i2c_probe(struct i2c_client *client,
> if (error)
> return error;
>  
> - wac_i2c = kzalloc(sizeof(*wac_i2c), GFP_KERNEL);
> - input = input_allocate_device();
> - if (!wac_i2c || !input) {
> - error = -ENOMEM;
> - goto err_free_mem;
> - }
> + wac_i2c = devm_kzalloc(dev, sizeof(*wac_i2c), GFP_KERNEL);
> + if (!wac_i2c)
> + return -ENOMEM;
>  
> wac_i2c->client = client;
> +
> + input = devm_input_allocate_device(dev);
> + if (!input)
> + return -ENOMEM;
> +
> wac_i2c->input = input;
>  
> input->name = "Wacom I2C Digitizer";
> input->id.bustype = BUS_I2C;
> input->id.vendor = 0x56a;
> input->id.version = features.fw_version;
> - input->dev.parent = &client->dev;
> input->open = wacom_i2c_open;
> input->close = wacom_i2c_close;
>  
> @@ -194,12 +196,11 @@ static int wacom_i2c_probe(struct i2c_client *client,
>  
> input_set_drvdata(input, wac_i2c);
>  
> - error = request_threaded_irq(client->irq, NULL, wacom_i2c_irq,
> -      IRQF_ONESHOT, "wacom_i2c", wac_i2c);
> + error = devm_request_threaded_irq(dev, client->irq, NULL, wacom_i2c_irq,
> +   IRQF_ONESHOT, "wacom_i2c", wac_i2c);
> if (error) {
> - dev_err(&client->dev,
> - "Failed to enable IRQ, error: %d\n", error);
> - goto err_free_mem;
> + dev_err(dev, "Failed to request IRQ: %d\n", error);
> + return error;
> }
>  
> /* Disable the IRQ, we'll enable it in wac_i2c_open() */
> @@ -207,31 +208,10 @@ static int wacom_i2c_probe(struct i2c_client *client,
>  
> error = input_register_device(wac_i2c->input);
> if (error) {
> - dev_err(&client->dev,
> - "Failed to register input device, error: %d\n", error);
> - goto err_free_irq;
> + dev_err(dev, "Failed to register input device: %d\n", error);
> + return error;
> }
>  
> - i2c_set_clientdata(client, wac_i2c);
> - return 0;
> -
> -err_free_irq:
> - free_irq(client->irq, wac_i2c);
> -err_free_mem:
> - input_free_device(input);
> - kfree(wac_i2c);
> -
> - return error;
> -}
> -
> -static int wacom_i2c_remove(struct i2c_client *client)
> -{
> - struct wacom_i2c *wac_i2c = i2c_get_clientdata(client);
> -
> - free_irq(client->irq, wac_i2c);
> - input_unregister_device(wac_i2c->input);
> - kfree(wac_i2c);
> -
> return 0;
> }
>  
> @@ -268,7 +248,6 @@ static struct i2c_driver wacom_i2c_driver = {
> },
>  
> .probe = wacom_i2c_probe,
> - .remove = wacom_i2c_remove,
> .id_table = wacom_i2c_id,
> };
> module_i2c_driver(wacom_i2c_driver);
> -- 
> 2.31.0.rc2.261.g7f71774620-goog
> 
>