vchan_synchronize(9)

💅 vchan_synchronize (kernel API manual, sec 9) 🎀

okay so bestie, welcome to the vchan_synchronize(9) page — yes it's a section 9 kernel API joint, and yes we're gonna make it make sense 🫶

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✨ NAME ✨

vchan_synchronize — synchronize callback execution to the current context ⏳✨

like, it's the function that makes sure the callbacks are Actually Done before you move on. periodt.

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🌸 SYNOPSIS 🌸

void vchan_synchronize (struct virt_dma_chan *vc );

that's it. that's the whole signature. void in, void out, one pointer in the middle. iconic behaviour honestly 👑

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🦋 ARGUMENTS 🦋

• vc — the virtual channel to synchronize 💫 this is the one you're waiting on, bestie, so pass it correctly, no cap.

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💜 DESCRIPTION 💜

okay so here's the vibe: vchan_synchronize makes sure that all scheduled or active callbacks have finished running. every last one. it's giving "wait for your friends before you leave the party" energy 🧚✨

but — and this is the important part, so like, listen — for proper operation, the caller has to ensure that no new callbacks are scheduled after the invocation of this function started. 😭 fr fr, if you keep yeeting new callbacks in while this is running, the guarantee doesn't hold. that's on you, not on the function. main character responsibility 💅

also! Free up the terminated cyclic descriptor to prevent memory leakage 🗑️💀 like, actually release it, because leaving it hanging is literally a memory leak and that's not the aesthetic we're going for. clean up your room, bestie.

⚠️ reminder bestie: this function ensures existing callbacks finished. it does not stop new ones from being scheduled — that's your job. don't make it weird 🙈

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🔥 SEE ALSO 🔥

• Kernel file ./drivers/dma/virt-dma.h — go read the header, it's the whole lore iykyk 📖
• vchan_tx_prep(9)
• vchan_issue_pending(9)
• vchan_cookie_complete(9)
• vchan_vdesc_fini(9)
• vchan_cyclic_callback(9)
• vchan_terminate_vdesc(9)
• vchan_next_desc(9)
• vchan_get_all_descriptors(9)

the whole vchan friend group, honestly. they all ate 💅🌈

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and that's the page!! this one lives in ./drivers/dma and it's dated October 2026 — so like, mark your calendar bestie, mwah 💖🎀 see u in the next manpage ⭐🦋