The tulip driver fails to initialize in a Linux VM running on Hyper-V. The following messages are logged in syslog when trying to load the tulip driver:
tulip: Linux Tulip drivers version 1.1.15 (Feb 27, 2007) tulip: 0000:00:0a.0: PCI INT A: failed to register GSI tulip: Cannot enable tulip board #0, aborting tulip: probe of 0000:00:0a.0 failed with error -16 The tulip drivers initialization function tulip_init_one() calls pci_enable_device(). The call to pci_enable_device() eventually results in a call to alloc_isa_irq_from_domain(), which returns -EBUSY (-16) The message "tulip: 0000:00:0a.0: PCI INT A: failed to register GSI" is logged by acpi_pci_irq_enable(). The flow of calls to the error is returned is: acpi_pci_irq_enable() - Logs the message "PCI INT A: failed to register GSI" acpi_register_gsi() __acpi_register_gsi() is afunction pointer -> acpi_register_gsi_ioapic() acpi_register_gsi_ioapic() mp_map_gsi_to_irq() mp_map_ppin_to_irq() alloc_isa_irq_from_domain() Returning -EBUSY when mp_check_pin_attr() returns false. mp_check_pin_attr() data->trigger = 1 data->polarity = 0 info->ioapic_trigger = 1 info->ioapic_polarity = 1 mp_check_pin_attr() returns false because the two polarity values do not match. acpi_register_gsi_ioapic() is setting trigger and polarity to: trigger = 1 polarity = 1 mp_check_pin_attr() is calling irq_get_chip_data(irq) which is returning a mp_chip_data structure with trigger = 1 polarity = 0 Since the two polarity values do not match, mp_check_pin_attr() returns false. Broken in 3.19.0 kernel Works in 3.17 kernel. Using commits to arch/x86/kernel/acpi/boot.c as reference, the commit where the issue appears is cd68f6bd53cf89d1d5ed889b8aaf65e9c3574a079 x86, irq, acpi: Git rid of special handling of GSI for ACPI SCI -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1440072 Title: [Hyper-V] Legacy network adapter is not detected To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1440072/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs