linux-kernel - Re: [PATCH v5 2/7] i2c: acpi: Use available IRQ helper functions

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Message-ID: <20190620145221.GC9224@smile.fi.intel.com>
Date:   Thu, 20 Jun 2019 17:52:21 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Charles Keepax <ckeepax@...nsource.cirrus.com>
Cc:     wsa@...-dreams.de, mika.westerberg@...ux.intel.com,
        jarkko.nikula@...ux.intel.com, linux-i2c@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        benjamin.tissoires@...hat.com, jbroadus@...il.com,
        patches@...nsource.cirrus.com
Subject: Re: [PATCH v5 2/7] i2c: acpi: Use available IRQ helper functions

On Thu, Jun 20, 2019 at 02:34:15PM +0100, Charles Keepax wrote:
> Use the available IRQ helper functions, most of the functions have
> additional helpful side affects like configuring the trigger type of the
> IRQ.
> 
> Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>

Some last minute observations / questions.

> +	struct resource r;
> +
> +	if (*irq <= 0 && acpi_dev_resource_interrupt(ares, 0, &r))
> +		*irq = i2c_dev_irq_from_resources(&r, 1);
> +
> +	return 1; /* No need to add resource to the list */

If we don't add it to the list, do we still need to manage the empty
resource_list below?

>  	/* Then fill IRQ number if any */
>  	INIT_LIST_HEAD(&resource_list);
> -	ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
> +	ret = acpi_dev_get_resources(adev, &resource_list,
> +				     i2c_acpi_add_resource, &irq);
>  	if (ret < 0)
>  		return -EINVAL;
>  
> -	resource_list_for_each_entry(entry, &resource_list) {
> -		if (resource_type(entry->res) == IORESOURCE_IRQ) {
> -			info->irq = entry->res->start;
> -			break;
> -		}
> -	}

> +	if (irq > 0)
> +		info->irq = irq;

Hmm... can't we just assign it directly inside the _add_resource() call back as
original code did?

-- 
With Best Regards,
Andy Shevchenko