linux-kernel - Re: [patch 24/35] net: brcmfmac: Replace in

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Date:   Mon, 28 Sep 2020 11:37:43 +0200
From:   Arend Van Spriel <arend.vanspriel@...adcom.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
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Subject: Re: [patch 24/35] net: brcmfmac: Replace in_interrupt()

On 9/28/2020 11:19 AM, Ulf Hansson wrote:
> On Mon, 28 Sep 2020 at 09:35, Arend Van Spriel
> <arend.vanspriel@...adcom.com> wrote:
>>
>> + Uffe
>>
>> On 9/27/2020 9:49 PM, Thomas Gleixner wrote:
>>> @@ -85,7 +85,7 @@ static void brcmf_sdiod_ib_irqhandler(st
>>>
>>>        brcmf_dbg(INTR, "IB intr triggered\n");
>>>
>>> -     brcmf_sdio_isr(sdiodev->bus);
>>> +     brcmf_sdio_isr(sdiodev->bus, false);
>>>    }
>>
>> Hi Uffe,
>>
>> I assume the above code is okay, but want to confirm. Is the SDIO
>> interrupt guaranteed to be on a worker thread?
> 
> Correct.
> 
> As a matter of fact, the sdio irqs can be delivered through a couple
> of different paths. The legacy (scheduled for removal), is from a
> dedicated kthread. The more "modern" way is either from the context of
> a threaded IRQ handler or via a workqueue.
> 
> However, there are also so-called out of band SDIO irqs, typically
> routed via a separate GPIO line. This isn't managed by the MMC/SDIO
> subsystem, but the SDIO functional driver itself.

In brcmfmac we indeed support the out-of-band interrupt. That scnenario 
is also taken care of in this patch. Thanks for the confirmation.

Regards,
Arend

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