linux-kernel - Re: [Bugfix] x86, irq: Fix bug in setting IOAPIC pin attributes

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Message-ID: <20140827080238.GH1785@lahna.fi.intel.com>
Date:	Wed, 27 Aug 2014 11:04:42 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Grant Likely <grant.likely@...aro.org>, x86@...nel.org,
	Prarit Bhargava <prarit@...hat.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>,
	Joerg Roedel <joro@...tes.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, Ingo Molnar <mingo@...nel.org>
Subject: Re: [Bugfix] x86, irq: Fix bug in setting IOAPIC pin attributes

On Wed, Aug 27, 2014 at 01:53:11PM +0800, Jiang Liu wrote:
> Commit 15a3c7cc9154321fc3 "x86, irq: Introduce two helper functions
> to support irqdomain map operation" breaks LPSS ACPI enumerated
> devices.
> 
> On startup, IOAPIC driver preallocates IRQ descriptors and programs
> IOAPIC pins with default level and polarity attributes for all legacy
> IRQs. Later legacy IRQ users may fail to set IOAPIC pin attributes
> if the requested attributes conflicts with the default IOAPIC pin
> attributes. So change mp_irqdomain_map() to allow the first legacy IRQ
> user to reprogram IOAPIC pin with different attributes.
> 
> Reported-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
> ---
> Hi Mika,
> 	We have a plan to kill function mp_set_gsi_attr() later, so
> I have slightly modified your changes. Could you please help to test
> it again?

Works fine here, thanks!

Tested-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
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