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x86, irq, PCI: Keep IRQ assignment for PCI devices during suspend/hibernation 

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.

Reported-and-Tested-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Len Brown <lenb@kernel.org>
Link: http://lkml.kernel.org/r/1407478071-29399-1-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jiang Liu 2014-08-08 14:07:51 +08:00 committed by Thomas Gleixner
parent 5e3bf215f4
commit 3eec595235
3 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/pci/intel_mid_pci.c
View File

@ -229,7 +229,7 @@ static int intel_mid_pci_irq_enable(struct pci_dev *dev)
static void intel_mid_pci_irq_disable(struct pci_dev *dev) static void intel_mid_pci_irq_disable(struct pci_dev *dev)
{ {
if (dev->irq > 0) if (!dev->dev.power.is_prepared && dev->irq > 0)
mp_unmap_irq(dev->irq); mp_unmap_irq(dev->irq);
} }

3
arch/x86/pci/irq.c
View File

@ -1256,7 +1256,8 @@ static int pirq_enable_irq(struct pci_dev *dev)
static void pirq_disable_irq(struct pci_dev *dev) static void pirq_disable_irq(struct pci_dev *dev)
{ {
if (io_apic_assign_pci_irqs && dev->irq) { if (io_apic_assign_pci_irqs && !dev->dev.power.is_prepared &&
dev->irq) {
mp_unmap_irq(dev->irq); mp_unmap_irq(dev->irq);
dev->irq = 0; dev->irq = 0;
} }

4
drivers/acpi/pci_irq.c
View File

@ -481,6 +481,10 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
if (!pin) if (!pin)
return; return;
/* Keep IOAPIC pin configuration when suspending */
if (dev->dev.power.is_prepared)
return;
entry = acpi_pci_irq_lookup(dev, pin); entry = acpi_pci_irq_lookup(dev, pin);
if (!entry) if (!entry)
return; return;