dma_fence_chain_get_prev(9)

✨ dma_fence_chain_get_prev(9) ✨

okay so this is a page from the Kernel API Manual, and bestie, we are about to get so cozy with RCU refcounting 💅

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🌸 NAME 🌸

dma_fence_chain_get_prev — use RCU to get a reference to the previous fence 🎀

like literally, that's the whole vibe: RCU in, reference out 💖

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🦋 SYNOPSIS 🦋

struct dma_fence * dma_fence_chain_get_prev (struct dma_fence_chain
*chain );

yes queen, that's the whole signature, copy it exactly, no cap ✨

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🍓 ARGUMENTS 🍓

• chain — the chain node you wanna get the previous node from 🫶 that's it, that's the one argument, she's lowkey carrying the whole function

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🌈 DESCRIPTION 🌈

okay so here's the tea ☕ — this function uses dma_fence_get_rcu_safe to grab a reference to the previous fence of the chain node.

that's it. that's the entire description. she's short, she's iconic, she does exactly one thing and she does it under RCU 👑

no extra lore bestie, i'm not gonna invent behaviour that isn't on the page — the manpage says it uses dma_fence_get_rcu_safe to get a reference to the previous fence of the chain node, and that is fr fr all we know 💀

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🧚 SEE ALSO 🧚

• kernel file ./drivers/dma-buf/dma-fence-chain.c 📁
• dma_fence_chain_walk(9)
• dma_fence_chain_find_seqno(9)
• dma_fence_chain_init(9)

go read those next, they're the rest of the friend group, iykyk 💜

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and that's the whole page bestie!! 🎀 this cutie lives in the kernel source tree under ./drivers/dma-buf, the version said October 2026, and yes the title is dma_fence_chain_get_prev(9) in case you forgot already 🙈 slay, go get that previous fence reference ⭐🔥👑