linux-kernel - Re: [PATCH v2 1/5] irqchip: add dumb demultiplexer implementation

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Date:	Tue, 13 Jan 2015 22:00:55 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>
cc:	Jason Cooper <jason@...edaemon.net>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 1/5] irqchip: add dumb demultiplexer implementation

On Tue, 13 Jan 2015, Boris Brezillon wrote:
> +	ret = irq_set_handler_data(irq, demux);
> +	if (ret) {
> +		pr_err("Failed to assign handler data\n");
> +		goto err_free_domain;
> +	}
> +
> +	irq_set_chained_handler(irq, irq_dumb_demux_handler);
> +
> +	/*
> +	 * Disable the src irq (automatically enabled by
> +	 * irq_set_chained_handler) to prevent irqs from happening while
> +	 * nobody requested any of the demuxed irqs.
> +	 */
> +	disable_irq(irq);

We rather prevent the startup of the irq line right away.

enum {
     IRQ_CHAINED_NONE,
     IRQ_CHAINED_STARTUP,
     IRQ_CHAINED_NOSTARTUP,
};

-__irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
-                  const char *name);
+__irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int chained_mode,
+                  const char *name);

{
....
        if (handle != handle_bad_irq && chained_mode) {
                irq_settings_set_noprobe(desc);
                irq_settings_set_norequest(desc);
                irq_settings_set_nothread(desc);
-               irq_startup(desc, true);
+               if (chained_mode == IRQ_CHAINED_STARTUP)
+                       irq_startup(desc, true);
	}
....
}

Hmm?

	tglx
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