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From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: Jiang Liu <jiang.liu@linux.intel.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Thomas Gleixner <tglx@linutronix.de>, Len Brown <lenb@kernel.org>,
	wfg@linux.intel.com, linux-kernel@vger.kernel.org,
	linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org,
	x86@kernel.org
Subject: Re: [Bugfix 1/2] ACPI, PCI, irq: Do not share PCI IRQ with ISA IRQ
Date: Mon, 28 Sep 2015 15:57:03 +0200	[thread overview]
Message-ID: <3135859.72R7vY9K7x@vostro.rjw.lan> (raw)
In-Reply-To: <20150925234040.GB23134@localhost>

On Friday, September 25, 2015 06:40:40 PM Bjorn Helgaas wrote:
> On Thu, Sep 17, 2015 at 02:02:45PM +0800, Jiang Liu wrote:
> > Avoid IRQs occupied by ISA IRQs when allocating IRQs for PCI link devices,
> > otherwise it may cause interrupt storm due to incompatible pin attributes.
> > 
> > This issue was triggered on a KVM virtual machine, which
> > 1) uses IRQ9 for SCI in high level mode.
> > 2) defines an PCI interrupt link device (LNKS) with IRQ9 as the only
> >    possible irq.
> > 3) has an PCI device referring to link device LNKS.
> > So it causes interrupt storm when enabling the PCI device because PCI IRQ
> > works in low level mode.
> > 
> > Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
> 
> Acked-by: Bjorn Helgaas <bhelgaas@google.com>

Thanks!

Queued up both this and the [2/2] for 4.3-rc4.

Thanks,
Rafael


      reply	other threads:[~2015-09-28 13:28 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-09-17  6:02 Jiang Liu
2015-09-17  6:02 ` [Bugfix 2/2] ACPI / PCI: Remove duplicated penalty on SCI IRQ Jiang Liu
2015-09-25 23:41   ` Bjorn Helgaas
2015-09-25 23:40 ` [Bugfix 1/2] ACPI, PCI, irq: Do not share PCI IRQ with ISA IRQ Bjorn Helgaas
2015-09-28 13:57   ` Rafael J. Wysocki [this message]

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