linux-kernel - Re: [PATCH] genirq: Fix bad IRQ

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Message-ID: <20150917.172108.1981672043896471427.okuno.kohji@jp.panasonic.com>
Date:	Thu, 17 Sep 2015 17:21:08 +0900
From:	Kohji Okuno <okuno.kohji@...panasonic.com>
To:	<tglx@...utronix.de>
CC:	<linux-kernel@...r.kernel.org>, <okuno.kohji@...panasonic.com>
Subject: Re: [PATCH] genirq: Fix bad IRQ_ONSHOT in forced IRQ setting

> On Thu, 17 Sep 2015, Kohji Okuno wrote:
>> If handler and thread_fn have valid function pointers for each
>> in request_thread_irq(), IRQF_ONESHOT is set unnecessarily in
>> irq_setup_forces_threading() in case of threadirqs.
>> As this result, the IRQ handler will not be called.
> 
> That explanation does not make sense. Which handler is not called?
> 
> Thanks,
> 
> 	tglx

Hi tglx,

Please refer to drivers/mmc/host/sdhci.c. sdhci uses sdhci_irq and
sdhci_thread_irq as the followings.

3366         sdhci_init(host, 0);
3367 
3368         ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq,
3369                                    IRQF_SHARED, mmc_hostname(mmc), host);

When I tested SDIO card, sdhci_irq() was not called after 1st SDIO interrupt.
After I applied my patch, this worked good.

Best regards,
 Kohji Okuno
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