pci_walk_bus_reverse(9)

💅 pci_walk_bus_reverse(9) — like, the Kernel API Manual, but make it make sense 💅

okay so bestie, picture this: you're deep in the Kernel API Manual and you need to walk a PCI bus, but backwards. Not forwards. Backwards. And this little function? She's the one. No cap.

✨ SYNOPSIS ✨

void pci_walk_bus_reverse (struct pci_bus *top , int (*cb)(struct
pci_dev *, void *) , void *userdata );

🎀 ARGUMENTS 🎀

• top — the bus whose devices should be walked. Like, this is the main character of the whole operation 💅
• cb — the callback that gets called for each device found. Every single one, bestie.
• userdata — an arbitrary pointer that gets passed to the callback. It's giving "bring your own vibes" ✨

🌸 DESCRIPTION 🌸

Same semantics as pci_walk_bus, but — and this is the plot twist — it walks the bus in reverse order. That's it. That's the function. She's iconic for exactly one reason and she owns it. 🦋

👑 SEE ALSO 👑

Kernel file ./drivers/pci/bus.c, plus these absolute legends:

• pci_bus_alloc_resource(9)
• pci_bus_add_device(9)
• pci_bus_add_devices(9)
• pci_walk_bus(9)

k that's the whole page, bestie 🫶 source is ./drivers/pci, dated October 2026, and yes it's still the Kernel API Manual. go walk some buses in reverse, periodt 💖🔥