__msi_unlock_descs(9)

💅 __msi_unlock_descs(9) — like, the Kernel API Manual, bestie 🎀

okay so this is __msi_unlock_descs, and it lives in the Kernel API Manual (section 9, obviously 💅). Let's get into it ✨

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✨ NAME ✨

__msi_unlock_descs — the function that unlocks the MSI descriptor storage of a device 🔓🫶

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🌸 SYNOPSIS 🌸

void __msi_unlock_descs (struct device *dev );

like yes that's the whole signature, she's short and sweet 💖

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🦋 ARGUMENTS 🦋

• dev — the Device to operate on, periodt. That's the one you're unlocking the storage for 🎀

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👑 DESCRIPTION 👑

so this is an internal function for guard(msi_descs_lock) — iykyk, it's the cleanup half of that guard thing 🧚

⚠️ bestie listen to me: Don't use in code. fr fr, it's not for you, it's an internal helper and using it is not the vibe 😭💀

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🌈 SEE ALSO 🌈

lowkey a whole friend group of related stuff, so here's everybody 💜

Kernel file ./kernel/irq/msi.c plus:

• struct msi_device_data(9)
• struct msi_ctrl(9)
• msi_alloc_desc(9)
• msi_domain_insert_msi_desc(9)
• msi_domain_free_msi_descs_range(9)
• msi_domain_add_simple_msi_descs(9)
• msi_setup_device_data(9)
• __msi_lock_descs(9) ← her literal counterpart, the lock to this unlock 🫶
• msi_domain_first_desc(9)
• msi_next_desc(9)
• msi_domain_get_virq(9)
• msi_device_populate_sysfs(9)
• msi_device_destroy_sysfs(9)
• msi_domain_set_affinity(9)
• msi_create_irq_domain(9)
• msi_create_parent_irq_domain(9)
• msi_parent_init_dev_msi_info(9)
• msi_create_device_irq_domain(9)
• msi_remove_device_irq_domain(9)
• msi_match_device_irq_domain(9)
• msi_domain_alloc_irqs_range_locked(9)
• msi_domain_alloc_irqs_range(9)
• msi_domain_alloc_irqs_all_locked(9)
• msi_domain_alloc_irq_at(9)
• msi_device_domain_alloc_wired(9)
• msi_domain_free_irqs_range_locked(9)
• msi_domain_free_irqs_range(9)
• msi_domain_free_irqs_all_locked(9)
• msi_domain_free_irqs_all(9)
• msi_device_domain_free_wired(9)
• msi_get_domain_info(9)
• msi_device_has_isolated_msi(9)

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🎀 okay that's the whole page!! this one came from ./kernel/irq, dated October 2026, and she's filed under __msi_unlock_descs(9) — slay, go unlock responsibly (or, y'know, don't, because internal function 😭) 💖✨🦋