From mboxrd@z Thu Jan  1 00:00:00 1970
From: JeffyChen <jeffy.chen-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
Subject: Re: [PATCH v2 01/13] iommu/rockchip: Request irqs in rk_iommu_probe()
Date: Wed, 17 Jan 2018 15:08:34 +0800
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To: Tomasz Figa <tfiga-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
Cc: Heiko Stuebner <heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org>, open-Y9sIeH5OGRo@public.gmane.org, list-Y9sIeH5OGRo@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Ricky Liang <jcliang-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>, "open list:ARM/Rockchip SoC..." <linux-rockchip-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>, IOMMU DRIVERS <iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
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Hi Tomasz,

Thanks for your reply.

On 01/17/2018 12:21 PM, Tomasz Figa wrote:
> Hi Jeffy,
>
> Thanks for the patch. Please see my comments inline.
>
> On Tue, Jan 16, 2018 at 10:25 PM, Jeffy Chen <jeffy.chen-TNX95d0MmH7DzftRWevZcw@public.gmane.org> wrote:
>
> Please add patch description.

ok, will do.
>
>> Suggested-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
>> Signed-off-by: Jeffy Chen <jeffy.chen-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
>> ---
> [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.
hmmm, right, i was thinking of removing num_irq, and do something like:
while (nr++) {
   err = platform_get_irq(dev, nr);
   if (err == -EPROBE_DEFER)
      break;
   if (err < 0)
      return err;
   ....
}

but forgot to do that..

>
>> +               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.)
>
right, forget about that. maybe we can check iommu->domain not NULL in 
rk_iommu_irq()

>>
>>          iommu->reset_disabled = device_property_read_bool(dev,
>
> ^^
>
> Best regards,
> Tomasz
>
>
>