acpm_wait_for_queue_slots(9)

💖 acpm_wait_for_queue_slots 💖

okay so bestie, this one's from the kernel API manual, like the acpm_wait_for_queue_slots(9) page — yes the title is literally the function name twice, that's just how manpages do, don't @ me 🎀

It's giving "tiny function, big responsibilities" honestly.

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✨ NAME ✨

acpm_wait_for_queue_slots — literally just waiting for queue slots. that's the whole vibe. she waits, she slays, she returns. 💅

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✨ SYNOPSIS ✨

int acpm_wait_for_queue_slots (struct acpm_chan *achan , u32
next_tx_front );

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🌸 ARGUMENTS 🌸

• achan — the ACPM channel info 🫶 like, the whole channel situation, handed to you.
• next_tx_front — the next front index of the TX queue ✨ (yes, front index, TX queue, iykyk — it's a u32, no cap).

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⭐ RETURN ⭐

• 0 on success 🎉 — she ate, no notes.
• -errno otherwise 😭 — the negative errno thing, standard kernel-core behaviour fr fr.

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🦋 SEE ALSO 🦋

First up, the kernel file this all lives in — no joke, go read it:

./drivers/firmware/samsung/exynos-acpm.c

And then the whole friend group 🌈 — structs and functions, all of them, in order, because we do not skip anyone in this house:

• struct acpm_shmem(9)
• struct acpm_chan_shmem(9)
• struct acpm_queue(9)
• struct acpm_rx_data(9)
• struct acpm_chan(9)
• struct acpm_info(9)
• struct acpm_match_data(9)
• acpm_get_saved_rx(9)
• acpm_get_rx(9)
• acpm_dequeue_by_polling(9)
• acpm_prepare_xfer(9)
• acpm_wait_for_message_response(9)
• acpm_do_xfer(9)
• acpm_set_xfer(9)
• acpm_chan_shmem_get_params(9)
• acpm_achan_alloc_cmds(9)
• acpm_free_mbox_chans(9)
• acpm_channels_init(9)
• acpm_handle_put(9)
• devm_acpm_release(9)
• acpm_get_by_node(9)
• devm_acpm_get_by_node(9)
• devm_acpm_get_by_phandle(9)

bestie if you're implementing queue slot waiting without at least glancing at struct acpm_queue(9) first, I'm gonna need you to breathe. 🧚

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and that's the page!! mwah 💜 this lil beauty ships out of ./drivers/firmware/samsung in October 2026 — go forth and wait for those slots responsibly, ily, bye 👑💖