linux-kernel - Re: [Bugfix 1/2] x86, irq, PCI: Keep IRQ assignment for PCI devices during suspend/hibernation

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Date:	Tue, 5 Aug 2014 20:37:29 +0200
From:	Borislav Petkov <bp@...en8.de>
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>,
	Grant Likely <grant.likely@...aro.org>, x86@...nel.org,
	Len Brown <lenb@...nel.org>,
	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
Subject: Re: [Bugfix 1/2] x86, irq, PCI: Keep IRQ assignment for PCI devices
 during suspend/hibernation

On Tue, Aug 05, 2014 at 11:26:17AM +0800, Jiang Liu wrote:
> Now IOAPIC driver dynamically allocates IRQ numbers for IOAPIC pins.
> We need to keep IRQ assignment for PCI devices during suspend/hibernation,
> otherwise it may cause failure of suspend/hibernation due to:
> 1) Device driver calls pci_enable_device() to allocate an IRQ number
>    and register interrupt handler on the returned IRQ.
> 2) Device driver's suspend callback calls pci_disable_device() and
>    release assigned IRQ in turn.
> 3) Device driver's resume callback calls pci_enable_device() to
>    allocate IRQ number again. A different IRQ number may be assigned
>    by IOAPIC driver this time.
> 4) Now the hardware delivers interrupt to the new IRQ but interrupt
>    handler is still registered against the old IRQ, so it breaks
>    suspend/hibernation.
> 
> To fix this issue, we keep IRQ assignment during suspend/hibernation.
> Flag pci_dev.dev.power.is_prepared is used to detect that
> pci_disable_device() is called during suspend/hibernation.
> 
> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
> ---
> Hi Borislav,
> 	Could you please help to review the patch again since I have
> made changes against the previous version?

I think you're asking me to test that patch, correct?

If so, what is the exact tree I need to apply? tip/x86/apic + those two
patches here? What else? What about the USB chunk which removes the proc
splat, is that somewhere too? Maybe Linus did pull it already?

Please specify what exactly I should test.

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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