dmaengine_d...llback_valid(9)

✨ dmaengine_d...llback_valid ✨

okay bestie, quick vibe check before we even start: this little cutie lives in the Kernel API Manual 💖 — that's the manual name, she's fancy. So when you're like "wait, which manual is this from??" it's that one. Slay. Now let's get into it 🫶

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🌸 NAME 🌸

dmaengine_desc_callback_valid — literally just verifying that the callback in cb is valid 💅 iykyk

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🦋 SYNOPSIS 🦋

bool dmaengine_desc_callback_valid (struct dmaengine_desc_callback *cb
);

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🎀 ARGUMENTS 🎀

• cb — the callback info struct, bestie. that's it, that's the whole argument 🍓

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✨ DESCRIPTION ✨

So what does it do? It returns a bool that verifies whether the callback in cb is valid or not. That's the whole assignment, and she ate. 👑

And the best part? no locking is required. none. zero. not a single lock. you don't have to worry about grabbing anything before you call her, she's lowkey self-sufficient like that 🧚

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💜 SEE ALSO 💜

Kernel file ./drivers/dma/dmaengine.h plus the whole friend group, all of them iconic in their own right:

• dma_cookie_init(9)
• dma_cookie_assign(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)

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ngl bestie, if you're in here you're probably already poking around in ./drivers/dma — that's the source path, she's home 🏡

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and that's the page!! mwah 💋 sign-off time: this one's from ./drivers/dma, dated October 2026, in the Kernel API Manual — literally notes from the future, we love a queen who's ahead of schedule ⭐🌈💖