qmi_bye_cb(9)

💖 qmi_bye_cb(9) — like, the kernel API manual, but make it make sense ✨

okay bestie, so this is a page from the Kernel API Manual, and today's main character is qmi_bye_cb — the qmi bye message callback. yes it's as iconic as it sounds. let's get into it 🫶

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🌸 NAME 🌸

qmi_bye_cb — the qmi bye message callback 💅

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🎀 SYNOPSIS 🎀

void qmi_bye_cb (struct qmi_handle *handle , unsigned int node );

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

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🦋 ARGUMENTS 🦋

• handle — the QMI handle, aka the whole vibe of the QMI thing you're working with 🔥
• node — the id of the dying node 😭 like, it's literally on its way out, show some respect

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⭐ DESCRIPTION ⭐

so here's the tea 🍓: this callback fires when the QMI bye control message gets received from the QMI client. someone's saying bye, and it's your job to handle it accordingly — no ghosting allowed 💀

how do you handle it? by making sure the USB offload path is disabled and cleaned up. that's the whole assignment. do it, slay it, move on. 👑

and like, important context: at this point, ADSP is not utilizing the USB bus. so yeah, that's where we're at. iykyk 🌈

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🧚 SEE ALSO 🧚

the whole friend group, fr fr — check these out when you're done here:

• the kernel file ./sound/usb/qcom/qc_audio_offload.c (yes, the actual file, go look at it ✨)
• uaudio_iommu_unmap(9)
• uaudio_iommu_map_pa(9)
• uaudio_dev_intf_cleanup(9)
• uaudio_event_ring_cleanup_free(9)
• disable_audio_stream(9)
• uaudio_sideband_notifier(9)
• qmi_svc_disconnect_cb(9)
• enable_audio_stream(9)
• uaudio_transfer_buffer_setup(9)
• uaudio_endpoint_setup(9)
• uaudio_event_ring_setup(9)
• uaudio_populate_uac_desc(9)
• prepare_qmi_response(9)
• handle_uaudio_stream_req(9)
• qc_usb_audio_offload_init_qmi_dev(9)
• qc_usb_audio_offload_probe(9)
• qc_usb_audio_cleanup_qmi_dev(9)
• qc_usb_audio_offload_disconnect(9)
• qc_usb_audio_offload_suspend(9)

that's a lot of links but honestly? iconic of them. read them all, bestie, i believe in you 🫶💜

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💡 little reminder: this lives in ./sound/usb/qcom — that's the home base for all this audio offload drama 🎧

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and that's the page!! mwah 💋 this cutie came from ./sound/usb/qcom, dated October 2026, and it's literally qmi_bye_cb(9) — okay bye bestie, go clean up that offload path 🎀💖✨