pci_rescan_bus(9)

💅 pci_rescan_bus(9) — the Kernel API Manual glow-up

okay so bestie, welcome to pci_rescan_bus(9), straight out of the Kernel API Manual ✨ this one's a whole little baddie of a function and honestly? it's giving "let me just check who's new in the building" energy 🎀

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✨ NAME ✨

pci_rescan_bus — Scan a PCI bus for devices 🔍🦋

like, the entire job. that's it. she scans. she finds. she slays.

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🌸 SYNOPSIS 🌸

unsigned int pci_rescan_bus (struct pci_bus *bus );

look at her. one argument. no cap, she's low-key elegant 💅

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🎀 ARGUMENTS 🎀

• bus — PCI bus to scan 🚌✨ the actual bus she's gonna go rummage through, bestie. the main character of this whole operation.

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💖 DESCRIPTION 💖

So here's the tea ☕ — pci_rescan_bus scans a PCI bus and its child buses looking for new devices, adds them, and enables them. Like a little talent scout walking the whole family tree of buses and going "ooh, new friend, you're in, you're enabled, welcome to the team" 🫶🎀

And because she's generous, she returns the max number of subordinate bus discovered 👑 that's the return value, bestie — the biggest count of subordinate buses she found down there. iconic behavior fr fr.

ngl this is the "did anything get hot-plugged while I wasn't looking" function and she ate 💀🔥

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🦋 SEE ALSO 🦋

Kernel file ./drivers/pci/probe.c — and like, the whole group chat of related functions, all of them invited to the party 🎉:

• __pci_size_bars(9)
• __pci_read_base(9)
• pcie_get_link_speed(9)
• pci_ea_fixed_busnrs(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)

go read them too, iykyk 👀📚

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aaaand that's the whole page, bestie 🌈💜 tysm for reading, mwah 💋

so this whole thing lives over in ./drivers/pci, dated October 2026, and it's literally titled pci_rescan_bus(9) — that's the source, the version, and the date, all wrapped up in a little bow 🎀✨ bye pookie, go scan some buses 🦋💖