linux-kernel - Re: [PATCH v7 08/34] i2c: tegra: Remove error message used for devm_request

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Date:   Thu, 17 Sep 2020 13:28:52 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 08/34] i2c: tegra: Remove error message used for
 devm_request_irq() failure

On Wed, Sep 09, 2020 at 01:39:40AM +0300, Dmitry Osipenko wrote:
> The error message prints number of vIRQ, which isn't a useful information.
> In practice devm_request_irq() never fails, hence let's remove the bogus
> message in order to make code cleaner.
> 
> Reviewed-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/i2c/busses/i2c-tegra.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)

I think I have seen this fail occasionally when something's wrong in the
IRQ code, or when we are not properly configuring the IRQ in device tree
for example.

So I'd prefer if this error message stayed here. I agree that it's not a
terribly useful error message, so perhaps adding the error code to it
would make it more helpful?

Thierry

> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
> index a52c72135390..b813c0976c10 100644
> --- a/drivers/i2c/busses/i2c-tegra.c
> +++ b/drivers/i2c/busses/i2c-tegra.c
> @@ -1807,10 +1807,8 @@ static int tegra_i2c_probe(struct platform_device *pdev)
>  
>  	ret = devm_request_irq(&pdev->dev, i2c_dev->irq, tegra_i2c_isr,
>  			       IRQF_NO_SUSPEND, dev_name(&pdev->dev), i2c_dev);
> -	if (ret) {
> -		dev_err(&pdev->dev, "Failed to request irq %i\n", i2c_dev->irq);
> +	if (ret)
>  		goto release_dma;
> -	}
>  
>  	i2c_set_adapdata(&i2c_dev->adapter, i2c_dev);
>  	i2c_dev->adapter.owner = THIS_MODULE;
> -- 
> 2.27.0
> 

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