dma_cookie_assign(9)

dma_cookie_assign(9) 💅

okay bestie, this page is from the Kernel API Manual, and it's literally about giving a DMA descriptor its own little cookie. slay. 🍪✨

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🎀 NAME 🎀

dma_cookie_assign — assign a DMA engine cookie to the descriptor. no cap, that's the whole vibe. 🦋

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✨ SYNOPSIS ✨

dma_cookie_t dma_cookie_assign (struct dma_async_tx_descriptor *tx );

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🧚 ARGUMENTS 🧚

• tx — the descriptor that needs a cookie. like, it's standing at the cookie counter, waiting. 🍪🙈

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💖 DESCRIPTION 💖

Assigns a unique non-zero per-channel cookie to the descriptor. periodt. it's not zero, it's not shared across channels, it's that descriptor's special little cookie. 💅✨

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⚠️ NOTE ⚠️

caller is expected to hold a lock to prevent concurrency. fr fr, do not skip this — the concurrency goblins are real. 😭🔒

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🦋 SEE ALSO 🦋

• Kernel file: ./drivers/dma/dmaengine.h
• dma_cookie_init(9)
• dma_cookie_complete(9)
• dma_cookie_status(9)
• dmaengine_desc_get_callback(9)
• dmaengine_desc_callback_invoke(9)
• dmaengine_desc_get_callback_invoke(9)
• dmaengine_desc_callback_valid(9)

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source/version/date check: ./drivers/dma · October 2026 · this iconic page is dma_cookie_assign(9) — bye bestie, hydrate and hold your locks 💖🎀✨