afu_dma_region_destroy(9)

💅 afu_dma_region_destroy(9) — like, the Kernel API Manual chapter, bestie ✨

okay so picture this: you're deep in the kernel, you've got a whole rbtree full of DMA regions, and you need them gone. Not one, not two — all of them. That's this function. She's the cleanup queen 👑 and she does not do partial.

---

✨ NAME ✨

afu_dma_region_destroy — destroy all regions in rbtree 🧹💖

Like, every single region. In the rbtree. All of them. No survivors, no cap.

---

🦋 SYNOPSIS 🦋

void afu_dma_region_destroy (struct dfl_feature_dev_data *fdata );

yes that's the whole signature, she's short and she knows it 💅

---

🌸 ARGUMENTS 🌸

• fdata — feature dev data 🫶 that's the struct dfl_feature_dev_data * bestie, the little bundle of feature goodness you're passing in

---

🎀 DESCRIPTION 🎀

okay so this is the important part and I need you to listen 🙈

Needs to be called with fdata->lock held.

that's it. that's the whole rule. no lock, no vibes. if you call this without holding fdata->lock you are not the main character, you're the cautionary tale 😭 take the lock first, then let her cook 🔥

---

⭐ SEE ALSO ⭐

• Kernel file ./drivers/fpga/dfl-afu-dma-region.c — the whole friend group lives here 🏠
• afu_dma_pin_pages(9)
• afu_dma_unpin_pages(9)
• afu_dma_check_continuous_pages(9)
• dma_region_check_iova(9)
• afu_dma_region_add(9)
• afu_dma_region_remove(9)
• afu_dma_region_find(9)
• afu_dma_region_find_iova(9)
• afu_dma_map_region(9)
• afu_dma_unmap_region(9)

the way that's the entire dma-region cinematic universe 🌈 go read them, iykyk

---

🍓 friendly reminder: fdata->lock held. always. fr fr. 💀

okay bye bestie, this page came from ./drivers/fpga, October 2026, and she's literally afu_dma_region_destroy(9) 🧚💜 slay ✨