linux-kernel - [PATCH] x86, irq: Keep IRQ assignment for PCI devices during suspend/hibernation

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Date:	Thu, 31 Jul 2014 08:33:26 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Borislav Petkov <bp@...en8.de>,
	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>, linux-pci@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86, irq: Keep IRQ assignment for PCI devices during suspend/hibernation

Function pci_disable_device() may be called for PCI devices during
suspend/hibernation, which in turn may release IRQ assigned for PCI
interrupt. Later when pci_enable_device() is called during resume,
a different IRQ may be assigned and thus break the driver.
So keep IRQ assignment for PCI devices during suspend/hibernation.
We check pci_dev.dev.power.is_prepared to detect that pci_disable_device()
and pci_enable_device() is called during suspend/hibernation.

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
Hi Borilav,
	Sorry for the incovenience, something is wrong when synchronizing
the patch.  I have found that "pm" should be "power" when building and
testing this patch on my test machine. And I have also fixed it on my
development machine, but forgot to do "stg refresh" before "git format-patch",
so caused the inconvenience.
Regards!
Gerry
---
 arch/x86/pci/common.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 059a76c29739..9115e7ae564b 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -662,14 +662,15 @@ int pcibios_enable_device(struct pci_dev *dev, int mask)
 	if ((err = pci_enable_resources(dev, mask)) < 0)
 		return err;
 
-	if (!pci_dev_msi_enabled(dev))
+	if (!pci_dev_msi_enabled(dev) && !dev->dev.power.is_prepared)
 		return pcibios_enable_irq(dev);
 	return 0;
 }
 
 void pcibios_disable_device (struct pci_dev *dev)
 {
-	if (!pci_dev_msi_enabled(dev) && pcibios_disable_irq)
+	if (!pci_dev_msi_enabled(dev) && pcibios_disable_irq &&
+	    !dev->dev.power.is_prepared)
 		pcibios_disable_irq(dev);
 }
 
-- 
1.7.10.4

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