ep93xx_dma_prep_slave_sg(9)

📦 version 7.3.1, in nixpkgs unstable

💅 ep93xx_dma_prep_slave_sg — kernel API manual, bestie edition ✨

okay so this is a page from the Kernel API Manual (section 9), and the star of the show is ep93xx_dma_prep_slave_sg. she prepares a slave DMA operation and honestly? she ate. let's get into it 🎀

🌸 NAME 🌸

ep93xx_dma_prep_slave_sg — prepare a slave DMA operation ✨

🦋 SYNOPSIS 🦋

struct dma_async_tx_descriptor * ep93xx_dma_prep_slave_sg (struct
dma_chan *chan , struct scatterlist *sgl , unsigned int sg_len , enum
dma_transfer_direction dir , unsigned long flags , void *context );

like, that's the whole vibe. six arguments, one descriptor, no cap 💅

💖 ARGUMENTS 💖

  • chan — the channel. that's it, that's the whole description, she's mysterious like that 🫶
  • sgl — the list of buffers to transfer (a scatterlist, iykyk) 🍓
  • sg_len — how many entries are in sgl. counting is important bestie 🔥
  • dir — the direction of the DMA transfer 👑
  • flags — flags for the descriptor ✨
  • context — operation context, and lowkey she's just there for the vibes because she is ignored 🙈

⭐ DESCRIPTION ⭐

returns a valid DMA descriptor… or NULL if it failed 😭 that's the whole plot. no plot twists, no secret lore, just: descriptor good, NULL bad. main character energy fr fr 💀

ngl bestie, always vibe check your return value before you use it. NULL means it did NOT slay.

🌈 SEE ALSO 🌈

kernel file ./drivers/dma/ep93xx_dma.c, plus the whole friend group:

like literally the entire group chat, all tagged, all accounted for 🧚💜

that's the page!! mwah 💋 this one lives in ./drivers/dma and it's dated October 2026 — source and version and everything, so you know it's legit. go prep those slave SG transfers, bestie, and remember: check for NULL 🎀✨💖

📦 where this page comes from