dma_async_device_register(9)

💖 dma_async_device_register(9) 💖

okay so bestie, welcome to the Kernel API Manual — this is dma_async_device_register, and it's literally the glow-up moment where your DMA device gets introduced to the whole kernel. group chat, say hi 👋

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✨ NAME ✨

dma_async_device_register — registers DMA devices found

like, it takes the DMA devices you found and makes it official 🎀

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🌸 SYNOPSIS 🌸

int dma_async_device_register (struct dma_device *device );

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🦋 ARGUMENTS 🦋

• device — pointer to struct dma_device. that's your baby, your main character, the struct you're about to make famous 💅

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👑 DESCRIPTION 👑

So here's the tea, and it's important tea 🫖

After you call this routine, the structure should not be freed — except in the device_release callback. That callback gets called after dma_async_device_unregister is called and no further references are taken.

no cap, this is the part people forget: you don't just kfree it whenever you feel like it. the device_release callback is the only exit, and it only opens up once unregister has happened and the reference count is fully drained. respect the lifecycle or it's giving undefined behaviour energy 💀

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🔥 SEE ALSO 🔥

Kernel file ./drivers/dma/dmaengine.c — and honestly the whole friend group, go say hi to all of them:

• dev_to_dma_chan(9)
• struct dma_chan_tbl_ent(9)
• dma_chan_is_local(9)
• min_chan(9)
• dma_channel_rebalance(9)
• balance_ref_count(9)
• dma_chan_get(9)
• dma_chan_put(9)
• dma_find_channel(9)
• dma_issue_pending_all(9)
• dma_get_slave_channel(9)
• __dma_request_channel(9)
• dma_request_chan(9)
• dma_request_chan_by_mask(9)
• devm_dma_request_chan(9)
• dmaengine_get(9)
• dmaengine_put(9)
• dma_async_device_unregister(9)
• dmaenginem_async_device_register(9)
• dma_wait_for_async_tx(9)
• dma_run_dependencies(9)

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~ 🧚 sign-off time 🧚 ~

this iconic little page lives in ./drivers/dma and it's stamped October 2026 — so yes, it's recent, it's fresh, and dma_async_device_register(9) is officially a whole vibe. go register some devices, bestie, and don't free that struct early 🌈💜