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| author | Jiang Liu <jiang.liu@linux.intel.com> | 2014-08-08 14:07:51 +0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2014-08-08 11:14:45 +0200 |
| commit | 3eec595235c17a74094daa1e02d1b0af2e9a7125 (patch) | |
| tree | 8311a41b3eef9c2758d342238ec78a6fc14d3567 /arch/x86 | |
| parent | 5e3bf215f4f2efc0af89e6dbc5da789744aeb5d7 (diff) | |
| download | linux-3eec595235c17a74094daa1e02d1b0af2e9a7125.tar.bz2 | |
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>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/pci/intel_mid_pci.c | 2 | ||||
| -rw-r--r-- | arch/x86/pci/irq.c | 3 |
2 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/pci/intel_mid_pci.c b/arch/x86/pci/intel_mid_pci.c index 09fece368592..3865116c51fb 100644 --- a/arch/x86/pci/intel_mid_pci.c +++ b/arch/x86/pci/intel_mid_pci.c @@ -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) { - if (dev->irq > 0) + if (!dev->dev.power.is_prepared && dev->irq > 0) mp_unmap_irq(dev->irq); } diff --git a/arch/x86/pci/irq.c b/arch/x86/pci/irq.c index 748cfe8ab322..bc1a2c341891 100644 --- a/arch/x86/pci/irq.c +++ b/arch/x86/pci/irq.c @@ -1256,7 +1256,8 @@ static int pirq_enable_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); dev->irq = 0; } |