pci_ea_fixed_busnrs(9)

🎀 NAME 🎀

okay bestie, this is pci_ea_fixed_busnrs from the Kernel API Manual ✨ — and it does exactly this: Read fixed Secondary and Subordinate bus numbers from EA capability. 💅

🌸 SYNOPSIS 🌸

signature first, no cap:

bool pci_ea_fixed_busnrs (struct pci_dev *dev , u8 *sec , u8 *sub );

💖 ARGUMENTS 💖

• dev — the Bridge 🌉
• sec — updated with secondary bus number from EA ✨
• sub — updated with subordinate bus number from EA 💖

🦋 DESCRIPTION 🦋

So like, if dev is a bridge with EA capability that specifies valid secondary and subordinate bus numbers, return true with the bus numbers in sec and sub. 🫶

Otherwise? return false. That's the vibe check. 💅

👑 SEE ALSO 👑

Kernel file ./drivers/pci/probe.c and the whole squad:

• __pci_size_bars(9)
• __pci_read_base(9)
• pcie_get_link_speed(9)
• pci_ext_cfg_is_aliased(9)
• pci_cfg_space_size_ext(9)
• pci_intx_mask_broken(9)
• pci_setup_device(9)
• pcie_relaxed_ordering_enabled(9)
• pci_release_dev(9)
• pci_scan_slot(9)
• pci_scan_child_bus_extend(9)
• pci_scan_child_bus(9)
• pcibios_root_bridge_prepare(9)
• pci_rescan_bus_bridge_resize(9)
• pci_rescan_bus(9)

🫶 made with love from ./drivers/pci, dated October 2026, and signed pci_ea_fixed_busnrs(9) — periodt. 💅✨