mite_init_ring_descriptors(9)

💅 mite_init_ring_descriptors — Kernel API Manual, bestie edition ✨

okay so you're in the Kernel API Manual and the function we're obsessing over today is mite_init_ring_descriptors — like, it literally sets up a MITE dma ring's descriptors 🎀 no cap.

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🌸 SYNOPSIS 🌸

int mite_init_ring_descriptors (struct mite_ring *ring , struct comedi_subdevice *s , unsigned int nbytes );

that's the whole vibe. three args, one int, let's go 💖

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🦋 ARGUMENTS 🦋

• ring — the MITE dma ring itself. the main character 👑
• s — a COMEDI subdevice. yes queen, we're in comedi land.
• nbytes — the size of the dma ring, and it's in bytes fr fr 🍓

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✨ DESCRIPTION ✨

So what it does: it initializes the ring buffer descriptors so that the DMA transfer links point at exactly the right amount of memory — not a byte more, not a byte less 💅 the way it sets everything up correct is honestly iconic.

Here's the tea 🫖: when the ring buffer gets allocated by mite_buf_change, the default behavior is to initialize the ring so it refers to the entire DMA data buffer. like, all of it, zero chill.

But a command can call this function later to re-initialize and shorten the amount of memory that will be transferred ✂️ so instead of the whole buffer, you get a smaller slice. lowkey so useful, highkey so specific. periodt.

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🔥 SEE ALSO 🔥

Kernel file ./drivers/comedi/drivers/mite.c — and the whole friend group 💜:

• mite_bytes_in_transit(9)
• mite_sync_dma(9)
• mite_ack_linkc(9)
• mite_done(9)
• mite_dma_arm(9)
• mite_dma_disarm(9)
• mite_prep_dma(9)
• mite_request_channel_in_range(9)
• mite_request_channel(9)
• mite_release_channel(9)
• mite_buf_change(9)
• mite_alloc_ring(9)
• mite_free_ring(9)
• mite_attach(9)
• mite_detach(9)

like, the entire roster. iykyk 🌈

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and that's the page, bestie 🫶 this lil gem lives in ./drivers/comedi/drivers, dated October 2026, and it's brought to you by the Kernel API Manual — go read the source, it ate 💀💖