pcim_iounmap_region(9)

💅 pcim_iounmap_region(9) — Kernel API Manual 💅

okay bestie, welcome to the Kernel API Manual corner for pcim_iounmap_region(9) — cleanup edition, no cap ✨

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✨ NAME ✨

pcim_iounmap_region — unmap and release a PCI BAR. that's the whole vibe 💅

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🌸 SYNOPSIS 🌸

void pcim_iounmap_region (struct pci_dev *pdev , int bar );

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🎀 ARGUMENTS 🎀

• pdev — the PCI device to operate on. your main-character struct pci_dev *, basically 🫶
• bar — the index of the BAR to unmap and release. very specific, very demure ✨

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🦋 DESCRIPTION 🦋

Manual cleanup moment, bestie 🧹 This unmaps a BAR and releases its region manually.

Only pass BARs that were previously mapped by pcim_iomap_region. like, that's the rule — don't be out here passing random BARs 🙈

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🌈 SEE ALSO 🌈

Kernel file: ./drivers/pci/devres.c — go peek if you want the source vibe 🌱

• devm_pci_remap_iospace(9)
• devm_pci_remap_cfgspace(9)
• devm_pci_remap_cfg_resource(9)
• pcim_set_mwi(9)
• pcim_intx(9)
• pcim_enable_device(9)
• pcim_pin_device(9)
• pcim_iomap_table(9)
• pcim_iomap(9)
• pcim_iounmap(9)
• pcim_iomap_region(9)
• pcim_iomap_regions(9)
• pcim_request_region(9)
• pcim_release_region(9)
• pcim_release_all_regions(9)
• pcim_request_all_regions(9)
• pcim_iomap_range(9)

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okay that's the page, bestie 🫶 source/version: ./drivers/pci · date: October 2026 · pcim_iounmap_region(9) signing off 💜✨