sdw_master_rt_free(9)

🎀 sdw_master_rt_free(9) 🎀

okay so this one is from the Kernel API Manual, and it's giving “cleanup era” ✨ like bestie, we are freeing runtime handles and being very mindful about locks. let's go 💅

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🌸 NAME 🌸

sdw_master_rt_free - Free Master runtime handle

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✨ SYNOPSIS ✨

void sdw_master_rt_free (struct sdw_master_runtime *m_rt , struct sdw_stream_runtime *stream );

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🫶 ARGUMENTS 🫶

• m_rt — Master runtime node. that's the main-character node, iykyk.
• stream — Stream runtime handle.

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💖 DESCRIPTION 💖

okay so real talk: this function is to be called with bus_lock held 🔒 do not skip that part, bestie. It frees the Master runtime handle and associated Slave(s) runtime handle. that's the whole slay.

and here's the little gotcha: if this is called first, then sdw_slave_rt_free will have no effect, because the Slave(s) runtime handle would already be freed up 💀 like, it already left the group chat.

fr fr: call it with bus_lock held. and if this one goes first, sdw_slave_rt_free is gonna have no effect since the Slave(s) runtime handle is already freed up.

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👑 SEE ALSO 👑

Kernel file: ./drivers/soundwire/stream.c — and the whole friend group is:

• sdw_program_port_params(9)
• sdw_enable_disable_slave_ports(9)
• sdw_enable_disable_ports(9)
• sdw_prep_deprep_ports(9)
• sdw_notify_config(9)
• sdw_program_params(9)
• sdw_ml_sync_bank_switch(9)
• sdw_slave_rt_alloc(9)
• sdw_slave_rt_config(9)
• sdw_slave_rt_free(9)
• sdw_master_rt_alloc(9)
• sdw_master_rt_config(9)
• sdw_config_stream(9)
• sdw_get_slave_dpn_prop(9)
• sdw_acquire_bus_lock(9)
• sdw_release_bus_lock(9)
• sdw_prepare_stream(9)
• sdw_enable_stream(9)
• sdw_disable_stream(9)
• sdw_deprepare_stream(9)
• sdw_alloc_stream(9)
• sdw_startup_stream(9)
• sdw_shutdown_stream(9)
• sdw_release_stream(9)
• sdw_stream_add_master(9)
• sdw_stream_remove_master(9)
• sdw_stream_add_slave(9)
• sdw_stream_remove_slave(9)

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xoxo from the Kernel API Manual bestie 💖 — source/version: ./drivers/soundwire, date: October 2026.