linux-kernel - Re: [patch 2/2] genirq: Provide irq_wake

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Message-ID: <20140215095028.GH14089@laptop.programming.kicks-ass.net>
Date:	Sat, 15 Feb 2014 10:50:28 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Chris Ball <chris@...ntf.net>, linux-mmc@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 2/2] genirq: Provide irq_wake_thread()

On Sat, Feb 15, 2014 at 12:55:19AM -0000, Thomas Gleixner wrote:
> In course of the sdhci/sdio discussion with Russell about killing the
> sdio kthread hackery we discovered the need to be able to wake an
> interrupt thread from software.
> 
> The rationale for this is, that sdio hardware can lack proper
> interrupt support for certain features. So the driver needs to poll
> the status registers, but at the same time it needs to be woken up by
> an hardware interrupt.
> 
> To be able to get rid of the home brewn kthread construct of sdio we
> need a way to wake an irq thread independent of an actual hardware
> interrupt.
> 
> Provide an irq_wake_thread() function which wakes up the thread which
> is associated to a given dev_id. This allows sdio to invoke the irq
> thread from the hardware irq handler via the IRQ_WAKE_THREAD return
> value and provides a possibility to wake it via a timer for the
> polling scenarios. That allows to simplify the sdio logic
> significantly.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

Acked-by: Peter Zijlstra <peterz@...radead.org>
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