pci_free_irq_vectors(9)

💖 pci_free_irq_vectors(9) 💖

okay so bestie, welcome to the Kernel API Manual — yes we're in kernel land today, grab a lil snack 🍓

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✨ NAME ✨

pci_free_irq_vectors — the function that frees the IRQs you previously allocated for a device 🫶

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🌸 SYNOPSIS 🌸

void pci_free_irq_vectors(struct pci_dev *dev);

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🎀 ARGUMENTS 🎀

• dev — the PCI device you wanna operate on, that's literally it 💅

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🦋 DESCRIPTION 🦋

Not me explaining this one, it's the undo button basically 💀

This function undoes the interrupt vector allocations — and any possible device MSI/MSI-X enablement — that you did earlier through pci_alloc_irq_vectors_affinity or pci_alloc_irq_vectors.

⚠️ WARNING, and this is a big one, no cap: do not call this function if the device has been enabled with pcim_enable_device. In that case, IRQ vectors are automatically managed via pcim_msi_release, and calling pci_free_irq_vectors can lead to double-free issues 😭 like please don't do that to yourself, that's giving undefined chaos energy fr fr

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🔥 SEE ALSO 🔥

Kernel file ./drivers/pci/msi/api.c — and also these iconic siblings of the family 👑

• pci_enable_msi(9)
• pci_disable_msi(9)
• pci_msix_vec_count(9)
• pci_enable_msix_range(9)
• pci_msix_can_alloc_dyn(9)
• pci_msix_alloc_irq_at(9)
• pci_msix_free_irq(9)
• pci_disable_msix(9)
• pci_alloc_irq_vectors(9)
• pci_alloc_irq_vectors_affinity(9)
• pci_irq_vector(9)
• pci_irq_get_affinity(9)
• pci_restore_msi_state(9)
• pci_msi_enabled(9)

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and that's the whole vibe, bestie 🧚💜 this little page lives in ./drivers/pci/msi, dated October 2026, and it's the Kernel API Manual edition of pci_free_irq_vectors(9). slay, go free your vectors responsibly ✨🌈👑