From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [RFC Part2 v1 02/21] genirq: Introduce helper functions to
 support stacked irq_chip
Date: Tue, 16 Sep 2014 10:45:26 -0700 (PDT)
Message-ID: <alpine.DEB.2.10.1409161044330.4247@nanos>
References: <1410444228-3134-1-git-send-email-jiang.liu@linux.intel.com> <1410444228-3134-3-git-send-email-jiang.liu@linux.intel.com>
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To: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>, Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>, "Rafael J. Wysocki" <rjw@rjwysocki.net>, Bjorn Helgaas <bhelgaas@google.com>, Randy Dunlap <rdunlap@infradead.org>, Yinghai Lu <yinghai@kernel.org>, Borislav Petkov <bp@alien8.de>, Grant Likely <grant.likely@linaro.org>, Marc Zyngier <marc.zyngier@arm.com>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>, Andrew Morton <akpm@linux-foundation.org>, Tony Luck <tony.luck@intel.com>, Joerg Roedel <joro@8bytes.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, x86@kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org
List-Id: linux-acpi@vger.kernel.org

On Thu, 11 Sep 2014, Jiang Liu wrote:
> +#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
> +void irq_chip_ack_parent(struct irq_data *data)
> +{
> +	data = data->parent_data;
> +	if (data && data->chip && data->chip->irq_ack)
> +		data->chip->irq_ack(data);

Why is this restricted to a single parent level and does not go down
the whole stack?

Thanks,

	tglx