ep93xx_dma_set_active(9)

💅 ep93xx_dma_set_active(9)

okay so bestie, you found a page from the Kernel API Manual ✨ and honestly? this one is tiny but it's important, so pay attention 🎀

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🌸 NAME 🌸

ep93xx_dma_set_active — set new active descriptor chain 💫

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✨ SYNOPSIS ✨

void ep93xx_dma_set_active (struct ep93xx_dma_chan *edmac , struct
       ep93xx_dma_desc *desc );

no cap, that's the whole signature 🫶

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🦋 ARGUMENTS 🦋

• edmac — the channel. that's it, that's the whole vibe. it's the channel 💅
• desc — head of the new active descriptor chain 👑

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💖 DESCRIPTION 💖

So what this does: it sets desc to be the head of the new active descriptor chain 🔥 and lowkey that matters because this is the chain that gets processed next. main character chain energy, fr fr.

⚠️ the active list must be empty before you call this function. like, empty empty. don't come in here with leftover chain, it's not the move 😭

And the rules of engagement, periodt:

• it's called with edmac->lock held 🔒
• interrupts are disabled when it's called 🚫⚡

that's not optional bestie, that's just how it is 💀

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🌈 SEE ALSO 🌈

Kernel file ./drivers/dma/ep93xx_dma.c — go read it, it's giving source of truth 📖✨

• struct ep93xx_dma_desc(9)
• struct ep93xx_dma_chan(9)
• struct ep93xx_dma_engine(9)
• ep93xx_dma_advance_active(9)
• ep93xx_dma_advance_work(9)
• ep93xx_dma_tx_submit(9)
• ep93xx_dma_alloc_chan_resources(9)
• ep93xx_dma_free_chan_resources(9)
• ep93xx_dma_prep_dma_memcpy(9)
• ep93xx_dma_prep_slave_sg(9)
• ep93xx_dma_prep_dma_cyclic(9)
• ep93xx_dma_synchronize(9)
• ep93xx_dma_terminate_all(9)
• ep93xx_dma_tx_status(9)
• ep93xx_dma_issue_pending(9)

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and that's the page!! 🧚 this lil icon lives in ./drivers/dma, dated October 2026, and it's signed ep93xx_dma_set_active(9) — slay, go hold that lock responsibly bestie 💜🫶