virtqueue_enable_cb(9)

✨ virtqueue_enable_cb ✨

okay bestie, welcome to the Kernel API Manual entry for virtqueue_enable_cb — yes that's the title, yes we're doing this 💅 this is the function that turns your callbacks back on after you turned them off, and honestly she's giving "wake up babe, new interrupts dropped" energy 🦋

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🌸 NAME 🌸

virtqueue_enable_cb — restart callbacks after disable_cb. that's it, that's the whole vibe ✨

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🎀 SYNOPSIS 🎀

bool virtqueue_enable_cb (struct virtqueue *_vq );

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💖 ARGUMENTS 💖

• _vq — the struct virtqueue we're talking about. like, the actual queue. the one and only. the main character 👑

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🔥 DESCRIPTION 🔥

So here's the tea: this re-enables callbacks 🫶 it's the "okay you can ping me again" text after you told the queue to stop pinging you.

BUT — and this is the important part, no cap — it returns "false" if there are pending buffers in the queue. why? to detect a possible race between the driver checking for more work, and enabling callbacks 😭 it's literally a vibe check for that exact window of chaos. so don't ignore the return value, bestie.

⚠️ Caller must ensure we don't call this with other virtqueue operations at the same time (except where noted). fr fr, don't be out here doing two things at once to the same queue, that's not the slay you think it is 💀

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👀 SEE ALSO 👀

Kernel file ./drivers/virtio/virtio_ring.c and all her friends (yes, the whole group chat, we're tagging everyone):

• virtqueue_add_sgs(9)
• virtqueue_add_outbuf(9)
• virtqueue_add_outbuf_premapped(9)
• virtqueue_add_inbuf(9)
• virtqueue_add_inbuf_cache_clean(9)
• virtqueue_add_inbuf_ctx(9)
• virtqueue_add_inbuf_premapped(9)
• virtqueue_dma_dev(9)
• virtqueue_kick_prepare(9)
• virtqueue_notify(9)
• virtqueue_kick(9)
• virtqueue_get_buf_ctx(9)
• virtqueue_disable_cb(9)
• virtqueue_enable_cb_prepare(9)
• virtqueue_poll(9)
• virtqueue_enable_cb_delayed(9)
• virtqueue_detach_unused_buf(9)
• vring_interrupt(9)
• virtqueue_resize(9)
• virtqueue_reset(9)
• virtqueue_get_vring_size(9)
• virtqueue_map_alloc_coherent(9)
• virtqueue_map_free_coherent(9)
• virtqueue_map_page_attrs(9)
• virtqueue_unmap_page_attrs(9)
• virtqueue_map_single_attrs(9)
• virtqueue_unmap_single_attrs(9)
• virtqueue_map_mapping_error(9)
• virtqueue_map_need_sync(9)
• virtqueue_map_sync_single_range_for_cpu(9)
• virtqueue_map_sync_single_range_for_device(9)

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and that's the whole page, periodt 🌈 this lil' slice of the docs lives in ./drivers/virtio and it's dated October 2026, so if you're reading this from the future — hi, ily, hope your callbacks are enabled 🎀💜