mei_msg_hdr_init(9)

✨ mei_msg_hdr_init(9) ✨

okay so bestie, welcome to the Kernel API Manual 💅 this one is mei_msg_hdr_init(9) and honestly? it's giving "small function, big main character energy." it does exactly one thing and it does it slayfully 🎀

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🌸 NAME 🌸

mei_msg_hdr_init — allocate and initialize mei message header 🦋

like, it makes the header. it sets up the header. that's the whole vibe check. no cap ✨

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🫶 SYNOPSIS 🫶

struct mei_msg_hdr * mei_msg_hdr_init (const struct mei_cl_cb *cb );

look at her. one argument, one pointer back. iconic 👑

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💖 ARGUMENTS 💖

• cb — the message callback structure 💌 that's it, that's the only thing you gotta hand over, and it's a const struct mei_cl_cb * so you're not even allowed to mess with it, periodt.

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🔥 RETURN 🔥

you get a pointer to the initialized header — freshly allocated, freshly initialized, all dressed up and ready to go 💅

but if it fails, you don't get NULL, you get ERR_PTR 😭 so pls pls pls check with IS_ERR() and don't just assume it's fine. the way that error pointer will humble you if you dereference it... 💀

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🌈 SEE ALSO 🌈

okay this section is long, like the group chat when someone says "guess what." but every single one of these matters, so here's the whole squad, no one left behind 🫶

the kernel file is ./drivers/misc/mei/client.c, and it's hanging out with:

mei_me_cl_init(9), mei_me_cl_get(9), mei_me_cl_release(9), mei_me_cl_put(9), __mei_me_cl_del(9), mei_me_cl_del(9), mei_me_cl_add(9), __mei_me_cl_by_uuid(9), mei_me_cl_by_uuid(9), mei_me_cl_by_id(9), __mei_me_cl_by_uuid_id(9), mei_me_cl_by_uuid_id(9), mei_me_cl_rm_by_uuid(9), mei_me_cl_rm_all(9), mei_io_cb_free(9), mei_tx_cb_enqueue(9), mei_tx_cb_dequeue(9), mei_cl_set_read_by_fp(9), mei_io_cb_init(9), mei_io_list_flush_cl(9), mei_io_tx_list_free_cl(9), mei_io_rd_list_free_fp(9), mei_cl_free_pending(9), mei_cl_alloc_cb(9), mei_cl_enqueue_ctrl_wr_cb(9), mei_cl_read_cb(9), mei_cl_flush_queues(9), mei_cl_init(9), mei_cl_allocate(9), mei_cl_link(9), mei_cl_unlink(9), mei_hbuf_acquire(9), mei_cl_wake_all(9), mei_cl_set_disconnected(9), mei_cl_irq_disconnect(9), __mei_cl_disconnect(9), mei_cl_disconnect(9), mei_cl_is_other_connecting(9), mei_cl_send_connect(9), mei_cl_irq_connect(9), mei_cl_connect(9), mei_cl_alloc_linked(9), mei_cl_tx_flow_ctrl_creds(9), mei_cl_tx_flow_ctrl_creds_reduce(9), mei_cl_vtag_alloc(9), mei_cl_fp_by_vtag(9), mei_cl_reset_read_by_vtag(9), mei_cl_read_vtag_add_fc(9), mei_cl_vt_support_check(9), mei_cl_add_rd_completed(9), mei_cl_del_rd_completed(9), mei_cl_notify_fop2req(9), mei_cl_notify_req2fop(9), mei_cl_irq_notify(9), mei_cl_notify_request(9), mei_cl_notify(9), mei_cl_notify_get(9), mei_cl_read_start(9), mei_cl_irq_write(9), mei_cl_write(9), mei_cl_complete(9), mei_cl_all_disconnect(9), mei_cl_irq_dma_map(9), mei_cl_irq_dma_unmap(9), mei_cl_dma_alloc_and_map(9), mei_cl_dma_unmap(9)

yeah. sixty-something friends. she's very well connected, iykyk 🧚✨

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lowkey reminder bestie: the return value can be an ERR_PTR, so vibe check it before you use it. do NOT raw-deref it. that's not a slay, that's a crash 😭💀

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and that's the whole page, bestie!! written in ./drivers/misc/mei, dated October 2026, still serving Kernel API Manual realness 🌸💜 go forth and initialize those headers responsibly 🫶✨🎀