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SubjectRe: [Patch v4] x86, irq, PCI: Keep IRQ assignment for runtime power management
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On Fri, Aug 29, 2014 at 11:26 AM, Jiang Liu <jiang.liu@linux.intel.com> wrote:
> Now IOAPIC driver dynamically allocates IRQ numbers for IOAPIC pins.
> We need to keep IRQ assignment for PCI devices during runtime power
> management, otherwise it may cause failure of device wakeups.
>
> Commit 3eec595235c17a7 "x86, irq, PCI: Keep IRQ assignment for PCI
> devices during suspend/hibernation" has fixed the issue for suspend/
> hibernation, we also need the same fix for runtime device sleep too.
>
> Fix: https://bugzilla.kernel.org/show_bug.cgi?id=83271
> Reported-and-Tested-by: EmanueL Czirai <amanual@openmailbox.org>
> Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
> ---
> arch/x86/include/asm/io_apic.h | 2 ++
> arch/x86/kernel/apic/io_apic.c | 12 ++++++++++++
> arch/x86/pci/intel_mid_pci.c | 2 +-
> arch/x86/pci/irq.c | 2 +-
> drivers/acpi/pci_irq.c | 4 ++++
> 5 files changed, 20 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
> index 0aeed5ca356e..478c490f3654 100644
> --- a/arch/x86/include/asm/io_apic.h
> +++ b/arch/x86/include/asm/io_apic.h
> @@ -227,6 +227,8 @@ static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned
>
> extern void io_apic_eoi(unsigned int apic, unsigned int vector);
>
> +extern bool mp_should_keep_irq(struct device *dev);
> +
> #else /* !CONFIG_X86_IO_APIC */
>
> #define io_apic_assign_pci_irqs 0
> diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
> index 29290f554e79..1e9a921d9701 100644
> --- a/arch/x86/kernel/apic/io_apic.c
> +++ b/arch/x86/kernel/apic/io_apic.c
> @@ -3946,6 +3946,18 @@ int mp_set_gsi_attr(u32 gsi, int trigger, int polarity, int node)
> return ret;
> }
>
> +bool mp_should_keep_irq(struct device *dev)
> +{
> + if (dev->power.is_prepared)
> + return true;
> +#ifdef CONFIG_PM_RUNTIME
> + if (dev->power.runtime_status == RPM_SUSPENDING)
> + return true;
> +#endif

No, you can't do that. It is racy and incorrect.

Please give me some time for looking into this.

Rafael


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