pci_resource_num(9)

💖 NAME 💖

okay bestie, welcome to the pci_resource_num(9) page from the Kernel API Manual — it's literally about doing a reverse lookup of the resource number from device resources, and I'm obsessed ✨

• pci_resource_num — Reverse lookup resource number from device resources 🫶

🎀 SYNOPSIS 🎀

int pci_resource_num (const struct pci_dev *dev , const struct resource
       *res );

🌸 ARGUMENTS 🌸

• dev — PCI device, the device we're working with 💅
• res — Resource to lookup index for. It MUST be a dev's resource — like, non-negotiable, bestie 😭

🦋 DESCRIPTION 🦋

So the whole vibe is a reverse lookup: pci_resource_num performs a reverse lookup to determine the resource number for res within the dev resource array. It's giving "find this resource's spot in the lineup" energy 🔥

⚠️ NOTE: The caller is responsible for ensuring res is among dev's resources! No cap, that check is on you — do not skip it 💀

⭐ RETURN ⭐

The resource number. slay, that's the return value 👑

🔥 SEE ALSO 🔥

Kernel file ./drivers/pci/pci.h, plus all these cross-reference cuties:

• PCI_FIND_NEXT_CAP(9)
• PCI_FIND_NEXT_EXT_CAP(9)
• pci_bar_index_is_valid(9)
• pci_id_from_device(9)
• pci_match_one_id(9)
• pci_dev_set_io_state(9)
• struct aer_err_info(9)

mwah 💖 source/version: ./drivers/pci — date: October 2026. signed off with Kernel API Manual energy, periodt 🌈✨