linux-kernel - Re: wlcore: might_sleep operation in interrupt handler

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Date:	Wed, 1 Aug 2012 00:48:17 +0400
From:	Denis Yefremov <yefremov.denis@...il.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Luciano Coelho <coelho@...com>,
	"John W. Linville" <linville@...driver.com>,
	Eliad Peller <eliad@...ery.com>,
	Arik Nemtsov <arik@...ery.com>, Eyal Shapira <eyal@...ery.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, ldv-project@...ras.ru
Subject: Re: wlcore: might_sleep operation in interrupt handler

More precise (IRQF_ONESHOT flag may be used):

int __devinit wlcore_probe(struct wl1271 *wl, struct platform_device *pdev)
{
...
        if (wl->platform_quirks & WL12XX_PLATFORM_QUIRK_EDGE_IRQ)
                irqflags = IRQF_TRIGGER_RISING;
        else
                irqflags = IRQF_TRIGGER_HIGH | IRQF_ONESHOT;

        ret = request_threaded_irq(wl->irq, wl12xx_hardirq, wlcore_irq,
                                   irqflags,
                                   pdev->name, wl);


2012/8/1 Johannes Berg <johannes@...solutions.net>:
> On Tue, 2012-07-31 at 22:28 +0400, Denis Yefremov wrote:
>> Interrupt handler wlcore_irq in wlcore/main.c file
>> invokes mutex_lock that is might sleep operation.
>
>> int __devinit wlcore_probe(struct wl1271 *wl, struct platform_device *pdev)
>> {
>> ...
>>         ret = request_threaded_irq(wl->irq, wl12xx_hardirq, wlcore_irq,
>>                                    irqflags,
>>                                    pdev->name, wl);
>
> Yes, umm, why do you think they're using a *threaded* IRQ? :-)
>
> johannes
>
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