scmi_wait_fo...age_response(9)

💅 scmi_wait_for_message_response(9) 💅

okay so bestie, welcome to the Kernel API Manual ✨ — yes that's the manual name, we're being fancy today 🎀. This little function is scmi_wait_for_message_response, and no cap, it's basically the "how are we waiting for our text back" decision-maker of the SCMI world 🦋.

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🌸 NAME 🌸

scmi_wait_for_message_response — literally a helper that pulls together all the possible ways of waiting for a synchronous message response 💖. One function to hold every vibe of waiting, periodt.

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✨ SYNOPSIS ✨

int scmi_wait_for_message_response (struct scmi_chan_info *cinfo ,
struct scmi_xfer *xfer );

yeah, that's the whole signature, keep it exactly like that 🫶

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🎀 ARGUMENTS 🎀

• cinfo — the SCMI channel info, iykyk 💫
• xfer — a reference to the transfer we're out here waiting for, main character energy 🔥

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💜 DESCRIPTION 💜

so here's the tea ☕: this function chooses its waiting strategy for you — sleep-waiting versus busy-waiting — depending on configuration flags, like xfer->hdr.poll_completion 🌈.

it's giving "let me pick the right outfit for the occasion", except the outfit is a wait loop 💅✨

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⭐ RETURN ⭐

returns 0 on Success 💖, and an error otherwise 😭 — that's it, that's the whole deal.

super short section, but we're not skipping it, bestie, we keep every detail in this house 👑

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🦋 SEE ALSO 🦋

Kernel file ./drivers/firmware/arm_scmi/driver.c — and the whole friend group 💖:

• struct scmi_xfers_info(9)
• struct scmi_protocol_instance(9)
• struct scmi_info(9)
• scmi_create_protocol_devices(9)
• scmi_xfer_token_set(9)
• scmi_xfer_token_clear(9)
• scmi_xfer_inflight_register_unlocked(9)
• scmi_xfer_inflight_register(9)
• scmi_xfer_raw_inflight_register(9)
• scmi_xfer_pending_set(9)
• scmi_xfer_get(9)
• scmi_xfer_raw_get(9)
• scmi_xfer_raw_channel_get(9)
• __scmi_xfer_put(9)
• scmi_xfer_raw_put(9)
• scmi_xfer_lookup_unlocked(9)
• scmi_bad_message_trace(9)
• scmi_msg_response_validate(9)
• scmi_xfer_state_update(9)
• scmi_xfer_command_acquire(9)
• scmi_rx_callback(9)
• xfer_put(9)
• scmi_xfer_raw_wait_for_message_response(9)
• do_xfer(9)
• do_xfer_with_response(9)
• xfer_get_init(9)
• version_get(9)
• scmi_set_protocol_priv(9)
• scmi_get_protocol_priv(9)
• scmi_common_extended_name_get(9)
• scmi_common_get_max_msg_size(9)
• scmi_protocol_msg_check(9)
• struct scmi_iterator(9)
• scmi_revision_area_get(9)
• scmi_protocol_version_negotiate(9)
• scmi_protocol_version_initialize(9)
• scmi_alloc_init_protocol_instance(9)
• scmi_get_protocol_instance(9)
• scmi_protocol_acquire(9)
• scmi_protocol_release(9)
• scmi_devm_protocol_get(9)
• scmi_devm_protocol_acquire(9)
• scmi_devm_protocol_put(9)
• scmi_is_transport_atomic(9)
• scmi_handle_get(9)
• scmi_handle_put(9)
• scmi_channels_setup(9)

like, that's a lot of siblings but we love them all equally 🧚💜

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and that's the page, bestie!! 🍓 sign-off time: this one lives at ./drivers/firmware/arm_scmi and it's dated October 2026 — screenshot it, memorize it, slay the kernel 💅👑✨