linux-kernel - Re: [PATCH v2 01/13] iommu/rockchip: Request irqs in rk_iommu

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Date:   Wed, 17 Jan 2018 13:21:44 +0900
From:   Tomasz Figa <tfiga@...omium.org>
To:     Jeffy Chen <jeffy.chen@...k-chips.com>
Cc:     linux-kernel@...r.kernel.org, Ricky Liang <jcliang@...omium.org>,
        Robin Murphy <robin.murphy@....com>,
        simon xue <xxm@...k-chips.com>,
        Heiko Stuebner <heiko@...ech.de>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        "open list:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 01/13] iommu/rockchip: Request irqs in rk_iommu_probe()

Hi Jeffy,

Thanks for the patch. Please see my comments inline.

On Tue, Jan 16, 2018 at 10:25 PM, Jeffy Chen <jeffy.chen@...k-chips.com> wrote:

Please add patch description.

> Suggested-by: Robin Murphy <robin.murphy@....com>
> Signed-off-by: Jeffy Chen <jeffy.chen@...k-chips.com>
> ---
[snip]
> -       for (i = 0; i < iommu->num_irq; i++) {
> -               iommu->irq[i] = platform_get_irq(pdev, i);
> -               if (iommu->irq[i] < 0) {
> -                       dev_err(dev, "Failed to get IRQ, %d\n", iommu->irq[i]);
> +       num_irq = of_irq_count(dev->of_node);
> +       for (i = 0; i < num_irq; i++) {
> +               irq = platform_get_irq(pdev, i);

This lacks consistency. of_irq_count() is used for counting, but
platform_get_irq() is used for getting. Either platform_ or of_ API
should be used for both and I'd lean for platform_, since it's more
general.

> +               if (irq < 0) {
> +                       dev_err(dev, "Failed to get IRQ, %d\n", irq);
>                         return -ENXIO;
>                 }
> +               err = devm_request_irq(iommu->dev, irq, rk_iommu_irq,
> +                                      IRQF_SHARED, dev_name(dev), iommu);
> +               if (err)
> +                       return err;
>         }

Looks like there is some more initialization below. Is the driver okay
with the IRQ being potentially fired right here? (Shared IRQ handlers
might be run at request_irq() time for testing.)

>
>         iommu->reset_disabled = device_property_read_bool(dev,

^^

Best regards,
Tomasz