scmi_notifier_unregister(9)

💅 scmi_notifier_unregister 💅

okay bestie, welcome to the Kernel API Manual — today's main character is scmi_notifier_unregister, and honestly? she's the cleanup queen we all need. ✨

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🎀 NAME 🎀

scmi_notifier_unregister — unregister a notifier_block for an event, aka the breakup text for your callback 💔

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🌸 SYNOPSIS 🌸

int scmi_notifier_unregister (const struct scmi_handle *handle , u8
proto_id , u8 evt_id , const u32 *src_id , struct notifier_block *nb );

that's the whole vibe, no cap 🫶

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🦋 ARGUMENTS 🦋

• handle — the handle that identifies the platform instance you're unregistering this callback against. like, which platform's party are we leaving, ykwim?
• proto_id — the protocol ID. u8. yes girl, a whole u8.
• evt_id — the event ID. also u8. slay.
• src_id — the source ID. it's a const u32 * pointer, so pls don't go mutating it 🙈
• nb — the actual notifier_block you're unregistering. the one getting kicked out of the group chat 💀

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💖 DESCRIPTION 💖

so what does she actually do? she takes care 💅 to unregister the provided nb from the notification chain that's associated with the specified event. chain membership revoked, periodt.

and THEN — and this is the iconic part — if there are no more users left for that event handler, she also frees the associated event handler structures. she's not just cleaning up her own mess, she's doing a full room reset when the last person leaves the party. 🧹✨

⚠️ heads up bestie: this freeing situation could possibly cause disabling of the event's generation at the platform level. so like, lowkey a bigger deal than it sounds. don't say I didn't warn you 🫶

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⭐ RETURN ⭐

0 on success. that's it, that's the whole return. zero equals happy. 🌈

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👑 SEE ALSO 👑

• Kernel file ./drivers/firmware/arm_scmi/notify.c
• Theory of operation(9)
• struct scmi_notify_instance(9)
• struct events_queue(9)
• struct scmi_event_header(9)
• struct scmi_registered_events_desc(9)
• struct scmi_registered_event(9)
• struct scmi_event_handler(9)
• scmi_lookup_and_call_event_chain(9)
• scmi_process_event_header(9)
• scmi_process_event_payload(9)
• scmi_events_dispatcher(9)
• scmi_notify(9)
• scmi_kfifo_free(9)
• scmi_initialize_events_queue(9)
• scmi_allocate_registered_events_desc(9)
• scmi_register_protocol_events(9)
• scmi_deregister_protocol_events(9)
• scmi_allocate_event_handler(9)
• scmi_free_event_handler(9)
• scmi_bind_event_handler(9)
• scmi_valid_pending_handler(9)
• scmi_register_event_handler(9)
• __scmi_event_handler_get_ops(9)
• scmi_get_active_handler(9)
• __scmi_enable_evt(9)
• scmi_put_handler_unlocked(9)
• scmi_event_handler_enable_events(9)
• scmi_notifier_register(9)
• scmi_devm_notifier_register(9)
• scmi_devm_notifier_unregister(9)
• scmi_protocols_late_init(9)
• scmi_notification_init(9)
• scmi_notification_quiesce(9)
• scmi_notification_exit(9)

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okay that's the whole page, go read the source if you want the deep lore 💜

✨💅 mwah 💅✨

— sourced from ./drivers/firmware/arm_scmi, dated October 2026, brought to you by the scmi_notifier_unregister(9) girlies 🎀🦋🌸🔥