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x86/xen: Override ACPI IRQ management callback __acpi_unregister_gsi
Xen overrides __acpi_register_gsi and leaves __acpi_unregister_gsi as is. That means, an IRQ allocated by acpi_register_gsi_xen_hvm() or acpi_register_gsi_xen() will be freed by acpi_unregister_gsi_ioapic(), which may cause undesired effects. So override __acpi_unregister_gsi to NULL for safety. Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Tested-by: Sander Eikelenboom <linux@eikelenboom.it> Cc: Tony Luck <tony.luck@intel.com> Cc: xen-devel@lists.xenproject.org Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Graeme Gregory <graeme.gregory@linaro.org> Cc: Lv Zheng <lv.zheng@intel.com> Link: http://lkml.kernel.org/r/1421720467-7709-4-git-send-email-jiang.liu@linux.intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -50,6 +50,7 @@ void acpi_pic_sci_set_trigger(unsigned int, u16);
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extern int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
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int trigger, int polarity);
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extern void (*__acpi_unregister_gsi)(u32 gsi);
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static inline void disable_acpi(void)
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{
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@ -458,6 +458,7 @@ int __init pci_xen_hvm_init(void)
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* just how GSIs get registered.
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*/
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__acpi_register_gsi = acpi_register_gsi_xen_hvm;
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__acpi_unregister_gsi = NULL;
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#endif
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#ifdef CONFIG_PCI_MSI
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@ -482,6 +483,7 @@ int __init pci_xen_initial_domain(void)
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pci_msi_ignore_mask = 1;
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#endif
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__acpi_register_gsi = acpi_register_gsi_xen;
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__acpi_unregister_gsi = NULL;
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/* Pre-allocate legacy irqs */
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for (irq = 0; irq < nr_legacy_irqs(); irq++) {
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int trigger, polarity;
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