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

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Message-ID: <20150918.182207.856288392397747867.okuno.kohji@jp.panasonic.com>
Date:	Fri, 18 Sep 2015 18:22:07 +0900
From:	Kohji Okuno <okuno.kohji@...panasonic.com>
To:	<tglx@...utronix.de>
CC:	<linux-kernel@...r.kernel.org>, <marc.zyngier@....com>,
	<okuno.kohji@...panasonic.com>
Subject: Re: [PATCH] genirq: Fix bad IRQ_ONSHOT in forced IRQ setting

From: Thomas Gleixner <tglx@...utronix.de>
Date: Fri, 18 Sep 2015 11:04:23 +0200
> That's weird. The flow is:
> 
> interrupt()
>   mask()
>   ret = primary_handler()
>   if (ret == WAKE_THREAD)
>     wake_thread()
>   else
>     unmask()
> 
> thread_handler()
>   ....
>   unmask()
> 
> So if an interrupt is triggered on the device while the interrupt is
> masked it should be raised again immediately when the unmask happens
> because its level type.
> 
> I'm wondering why that doesn't work.

Yes. I think so. And, I have just found that sdhci_thread_irq() don't
finish in this case. I'm analyzing about this now. But, after I apply
my patch, sdhci_thread_irq() can finish. I will share the result with
you.

Best regards,
 Kohji Okuno
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