pci_disable_msix(9)

💅 pci_disable_msix — kernel API manual, but make it make sense

okay bestie, buckle up, this one's from the Kernel API Manual and it's literally all about turning MSI-X off 🛑

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🌸 NAME 🌸

pci_disable_msix — disable MSI-X interrupt mode on a device, that's the whole vibe

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✨ SYNOPSIS ✨

void pci_disable_msix (struct pci_dev *dev );

like, that's it. that's the call. no return value, no drama 🫶

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🎀 ARGUMENTS 🎀

• dev — the PCI device you wanna operate on 💖 this is your main character right here

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🦋 DESCRIPTION 🦋

so this is the legacy device driver API, and its whole job is a little three-part slay:

1. disable MSI-X interrupt mode on the device
2. free the interrupt vectors that got allocated earlier
3. restore INTx

and the way it does that? the PCI device's Linux IRQ (dev->irq) gets restored back to its default pin assertion IRQ 🌈 no cap, that's the detail.

also highkey important: this is the cleanup pair of pci_enable_msix_range — they're literally a matching set, yin and yang, enable and disable, periodt 💅

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⭐ NOTE ⭐

okay so real talk: in general you should be using the newer pci_alloc_irq_vectors / pci_free_irq_vectors API pair instead of this one 🙈 like this one still works, it's just not the moment anymore.

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🔥 SEE ALSO 🔥

kernel file ./drivers/pci/msi/api.c — go read it, iykyk 👑

• 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_alloc_irq_vectors(9)
• pci_alloc_irq_vectors_affinity(9)
• pci_irq_vector(9)
• pci_irq_get_affinity(9)
• pci_free_irq_vectors(9)
• pci_restore_msi_state(9)
• pci_msi_enabled(9)

all the besties in the friend group, fr fr 💜

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and that's the page! this little icon lives over in ./drivers/pci/msi, the version stamp says October 2026, and the header/footer both rep pci_disable_msix(9) — ok bye, go free those vectors 🧚‍♀️✨