dma_fence_c...ignal_locked(9)

💖 NAME 💖

dma_fence_check_and_signal_locked — signal the fence if it's not yet signaled

okay so welcome to the dma_fence_c...ignal_locked(9) page from the Kernel API Manual, bestie. this one is short and sweet, and it's lowkey iconic: check the fence, signal it if it hasn't been signaled yet. 💅

🦋 SYNOPSIS 🦋

bool dma_fence_check_and_signal_locked (struct dma_fence *fence );

🌸 ARGUMENTS 🌸

• fence — the fence to check and signal.

✨ DESCRIPTION ✨

Checks whether a fence was signaled and signals it if it was not yet signaled. that's the whole vibe. no cap.

⚠️ lock girlies, listen up: unlike dma_fence_check_and_signal, this function must be called with struct dma_fence.lock being held. not “probably held,” not “held in spirit” — actually held. periodt. 💀

🎀 RETURN 🎀

• true if fence has been signaled already.
• false otherwise.

🔥 SEE ALSO 🔥

the Kernel file is literally ./drivers/dma-buf/dma-fence.c, and here's the whole bestie crew:

• DMA fences overview(9)
• fence cross-driver contract(9)
• dma_fence_get_stub(9)
• dma_fence_allocate_private_stub(9)
• dma_fence_context_alloc(9)
• fence signalling annotation(9)
• dma_fence_begin_signalling(9)
• dma_fence_end_signalling(9)
• dma_fence_signal_timestamp_locked(9)
• dma_fence_signal_timestamp(9)
• dma_fence_signal_locked(9)
• dma_fence_check_and_signal(9)
• dma_fence_signal(9)
• dma_fence_wait_timeout(9)
• dma_fence_release(9)
• dma_fence_free(9)
• dma_fence_enable_signaling(9)
• dma_fence_add_callback(9)
• dma_fence_get_status(9)
• dma_fence_remove_callback(9)
• dma_fence_default_wait(9)
• dma_fence_wait_any_timeout(9)
• deadline hints(9)
• dma_fence_set_deadline(9)
• dma_fence_describe(9)
• dma_fence_init(9)
• dma_fence_init64(9)
• dma_fence_driver_name(9)
• dma_fence_timeline_name(9)

source/version + date: ./drivers/dma-buf · October 2026 · page: dma_fence_c...ignal_locked(9) — bye bestie, go signal responsibly 💖✨🫶