ipa_modem_wake_queue_work(9)

🌸 ipa_modem_wake_queue_work 🌸

okay so this is a page from the Kernel API Manual (section 9, kernel-space vibes only 💅) and it's literally all about one tiny little function that wakes up a network queue. she's small but she's important, iykyk.

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✨ NAME ✨

ipa_modem_wake_queue_work — enable modem netdev queue 🫶

like, that's her whole job. enabling the queue. iconic behavior honestly.

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🦋 SYNOPSIS 🦋

void ipa_modem_wake_queue_work (struct work_struct *work );

that's it. that's the whole signature. no cap. ✨

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🎀 ARGUMENTS 🎀

• work — the Work structure 💼 like bestie this is literally just the work struct, that's the whole argument, she takes one (1) thing and it's a pointer to a work_struct.

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💖 DESCRIPTION 💖

so here's the tea ☕ — this function re-enables transmit on the modem network device. transmit! on! the! modem! netdev! 🔥

she gets called in (power management) work queue context, and she's scheduled for when the modem is resuming. like, the resume party is happening and this work item is on the guest list. 🧚

now, the big question everyone asks: why can't we just enable the queue directly inside ipa_modem_resume? bestie. bestie. listen. 😭 because the second you wake the queue up, transmits restart instantly. immediately. no chill whatsoever. but here's the problem — the device power state won't be ACTIVE until after ipa_modem_resume returns. so there's this awkward little window where the queue is awake but the power state is still like "hiii I'm not ready yet 🙈".

and if a transmit gets restarted before that window closes? it would stop the queue again and get -EINPROGRESS from pm_runtime_get. 💀 and here's the truly cursed part: since this work would have already run at that point, nothing would ever wake the queue again. forever. permanently asleep. a queue in a coma. not slay. 😭

so the whole point, the entire reason this function exists as a separate work item, is to wait for the resume to complete before waking the queue. patience. ✨ delayed gratification. she waits her turn and then she slays. 👑

⚠️ lowkey the moral of the story is: do not enable the queue early, or you will create a permanently sleeping queue and zero things will ever wake her up again. respect the ordering bestie. 🫶

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🌈 SEE ALSO 🌈

• the Kernel file ./drivers/net/ipa/ipa_modem.c — go read the source, it's giving main character energy 📖
• struct ipa_priv(9) — her struct, her lore 💜

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okay that's the whole page!! 💅 this came out of the ./drivers/net/ipa corner of the kernel, dated October 2026, and it's officially the ipa_modem_wake_queue_work(9) chapter of the Kernel API Manual. go wake those queues responsibly, bestie 🎀✨🦋🌸🫶