spi_replace_transfers(9)

🌸 spi_replace_transfers(9) 🌸

okay bestie, welcome to the Kernel API Manual — today's main character is spi_replace_transfers, and honestly? she's kind of a big deal in the SPI world 💅

---

✨ NAME ✨

spi_replace_transfers — the function that swaps out transfers for a whole new set of transfers (yes, plural, she's extra) and registers that change with spi_message.resources 🎀

---

🦋 SYNOPSIS 🦋

struct spi_replaced_transfers * spi_replace_transfers (struct
spi_message *msg , struct spi_transfer *xfer_first , size_t remove ,
size_t insert , spi_replaced_release_t release , size_t extradatasize ,
gfp_t gfp );

like, look at all those parameters. she's thorough. we respect it 💖

---

👑 ARGUMENTS 👑

• msg — the spi_message we're working on, aka the vibe we're operating within ✨
• xfer_first — the very first spi_transfer we wanna replace. first one up, no cap 🫶
• remove — how many transfers to remove. bye bestie 💀
• insert — how many transfers we want to insert instead. hello new besties 🌈
• release — extra release code that's necessary in some circumstances (iykyk) 🔥
• extradatasize — extra data to allocate, and it comes with alignment guarantees of struct spi_transfer 🎯
• gfp — the gfp flags, standard allocation-flavored stuff 🧚

---

⭐ RETURN ⭐

a pointer to spi_replaced_transfers on the happy path, or PTR_ERR(...) if things went sideways 😭 — so like, always check before you celebrate, fr fr.

---

💜 SEE ALSO 💜

she travels with a whole entourage, omg. the kernel file is ./drivers/spi/spi.c and the squad is:

• __spi_register_driver(9)
• spi_alloc_device(9)
• spi_add_device(9)
• spi_new_device(9)
• spi_unregister_device(9)
• spi_register_board_info(9)
• spi_res_alloc(9)
• spi_res_free(9)
• spi_res_add(9)
• spi_res_release(9)
• spi_finalize_current_transfer(9)
• __spi_pump_messages(9)
• spi_pump_messages(9)
• spi_take_timestamp_pre(9)
• spi_take_timestamp_post(9)
• spi_set_thread_rt(9)
• spi_get_next_queued_message(9)
• spi_finalize_current_message(9)
• spi_queued_transfer(9)
• spi_flush_queue(9)
• of_register_spi_devices(9)
• spi_new_ancillary_device(9)
• devm_spi_new_ancillary_device(9)
• acpi_spi_count_resources(9)
• acpi_spi_device_alloc(9)
• spi_target_abort(9)
• __spi_alloc_controller(9)
• __devm_spi_alloc_controller(9)
• spi_get_gpio_descs(9)
• spi_register_controller(9)
• devm_spi_register_controller(9)
• spi_unregister_controller(9)
• spi_split_transfers_maxsize(9)
• spi_split_transfers_maxwords(9)
• spi_set_cs_timing(9)
• spi_setup(9)
• spi_optimize_message(9)
• spi_unoptimize_message(9)
• devm_spi_optimize_message(9)
• spi_async(9)
• spi_sync(9)
• spi_sync_locked(9)
• spi_bus_lock(9)
• spi_bus_unlock(9)
• spi_write_then_read(9)

like… that's a whole group chat, and she's the admin 💅👑

---

and that's the page, bestie!! courtesy of the ./drivers/spi source, dated October 2026 — save it, screenshot it, send it to the group chat, periodt 🎀✨🦋