linux-kernel - Re: [PATCH 4/4] Input: ep93xx_keypad - switch to using managed resources

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Date:   Tue, 12 Oct 2021 09:54:32 +0200
From:   Alexander Sverdlin <alexander.sverdlin@...il.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-input@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] Input: ep93xx_keypad - switch to using managed
 resources

Hello Dmitry,

just one question below:

On Mon, 2021-10-11 at 18:37 -0700, Dmitry Torokhov wrote:
> By using managed resources (devm) we are able to streamline error handling
> in probe and remove most of the custom remove method.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
>  drivers/input/keyboard/ep93xx_keypad.c | 116 ++++++++-----------------
>  1 file changed, 36 insertions(+), 80 deletions(-)
> 
> diff --git a/drivers/input/keyboard/ep93xx_keypad.c b/drivers/input/keyboard/ep93xx_keypad.c
> index a66cfeaf5b21..90157707dc05 100644
> --- a/drivers/input/keyboard/ep93xx_keypad.c
> +++ b/drivers/input/keyboard/ep93xx_keypad.c

...

> @@ -227,61 +234,46 @@ static int ep93xx_keypad_probe(struct platform_device *pdev)
>         struct resource *res;
>         int err;
>  
> -       keypad = kzalloc(sizeof(struct ep93xx_keypad), GFP_KERNEL);
> +       keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad), GFP_KERNEL);
>         if (!keypad)
>                 return -ENOMEM;
>  
>         keypad->pdata = dev_get_platdata(&pdev->dev);
> -       if (!keypad->pdata) {
> -               err = -EINVAL;
> -               goto failed_free;
> -       }
> +       if (!keypad->pdata)
> +               return -EINVAL;
>  
>         keymap_data = keypad->pdata->keymap_data;
> -       if (!keymap_data) {
> -               err = -EINVAL;
> -               goto failed_free;
> -       }
> +       if (!keymap_data)
> +               return -EINVAL;
>  
>         keypad->irq = platform_get_irq(pdev, 0);
> -       if (keypad->irq < 0) {
> -               err = keypad->irq;
> -               goto failed_free;
> -       }
> +       if (keypad->irq < 0)
> +               return keypad->irq;
>  
>         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -       if (!res) {
> -               err = -ENXIO;
> -               goto failed_free;
> -       }
> -
> -       res = request_mem_region(res->start, resource_size(res), pdev->name);
> -       if (!res) {
> -               err = -EBUSY;
> -               goto failed_free;
> -       }
> +       if (!res)
> +               return -ENXIO;
>  
> -       keypad->mmio_base = ioremap(res->start, resource_size(res));
> -       if (keypad->mmio_base == NULL) {
> -               err = -ENXIO;
> -               goto failed_free_mem;
> -       }
> +       keypad->mmio_base = devm_ioremap_resource(&pdev->dev, res);
> +       if (IS_ERR(keypad->mmio_base))
> +               return PTR_ERR(keypad->mmio_base);
>  
>         err = ep93xx_keypad_acquire_gpio(pdev);
>         if (err)
> -               goto failed_free_io;
> +               return err;
> +
> +       err = devm_add_action_or_reset(&pdev->dev,
> +                                      ep93xx_keypad_release_gpio_action, pdev);
> +       if (err)
> +               return err;
>  
>         keypad->clk = clk_get(&pdev->dev, NULL);

Isn't the conversion to devm_clk_get() missing here?

> -       if (IS_ERR(keypad->clk)) {
> -               err = PTR_ERR(keypad->clk);
> -               goto failed_free_gpio;
> -       }
> +       if (IS_ERR(keypad->clk))
> +               return PTR_ERR(keypad->clk);
>  
> -       input_dev = input_allocate_device();
> -       if (!input_dev) {
> -               err = -ENOMEM;
> -               goto failed_put_clk;
> -       }
> +       input_dev = devm_input_allocate_device(&pdev->dev);
> +       if (!input_dev)
> +               return -ENOMEM;
>  
>         keypad->input_dev = input_dev;
>  
> @@ -289,26 +281,26 @@ static int ep93xx_keypad_probe(struct platform_device *pdev)
>         input_dev->id.bustype = BUS_HOST;
>         input_dev->open = ep93xx_keypad_open;
>         input_dev->close = ep93xx_keypad_close;
> -       input_dev->dev.parent = &pdev->dev;
>  
>         err = matrix_keypad_build_keymap(keymap_data, NULL,
>                                          EP93XX_MATRIX_ROWS, EP93XX_MATRIX_COLS,
>                                          keypad->keycodes, input_dev);
>         if (err)
> -               goto failed_free_dev;
> +               return err;
>  
>         if (keypad->pdata->flags & EP93XX_KEYPAD_AUTOREPEAT)
>                 __set_bit(EV_REP, input_dev->evbit);
>         input_set_drvdata(input_dev, keypad);
>  
> -       err = request_irq(keypad->irq, ep93xx_keypad_irq_handler,
> -                         0, pdev->name, keypad);
> +       err = devm_request_irq(&pdev->dev, keypad->irq,
> +                              ep93xx_keypad_irq_handler,
> +                              0, pdev->name, keypad);
>         if (err)
> -               goto failed_free_dev;
> +               return err;
>  
>         err = input_register_device(input_dev);
>         if (err)
> -               goto failed_free_irq;
> +               return err;
>  
>         platform_set_drvdata(pdev, keypad);
>  

-- 
Alexander Sverdlin.