dma_fence_wait(9)

💤 NAME 💤

okay so bestie, this is dma_fence_wait — the function that will sleep until the fence gets signaled 😴✨. We're in the Kernel API Manual, and this one is short but important, so pay attention 💅.

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🌸 SYNOPSIS 🌸

signed long dma_fence_wait (struct dma_fence *fence , bool intr );

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🎀 ARGUMENTS 🎀

• fence — the fence to wait on 💖
• intr — if true, do an interruptible wait ✨

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🦋 DESCRIPTION 🦋

This function will return -ERESTARTSYS if interrupted by a signal, or 0 if the fence was signaled. Other error values may be returned on custom implementations. 🫶

It performs a synchronous wait on this fence. It is assumed the caller directly or indirectly holds a reference to the fence, otherwise the fence might be freed before return, resulting in undefined behavior. ⚠️

bestie, this is the part where you do not skip the reference check. If the caller doesn't directly or indirectly hold a reference to the fence, the fence might be freed before return, and that's undefined behavior — the scary kind 😭💀.

See also dma_fence_wait_timeout and dma_fence_wait_any_timeout. 👀

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👑 SEE ALSO 👑

the whole fence friend group showed up, periodt:

• Kernel file ./include/linux/dma-fence.h
• struct dma_fence(9)
• struct dma_fence_cb(9)
• struct dma_fence_ops(9)
• dma_fence_was_initialized(9)
• dma_fence_put(9)
• dma_fence_get(9)
• dma_fence_get_rcu(9)
• dma_fence_get_rcu_safe(9)
• dma_fence_spinlock(9)
• dma_fence_lock_irqsave(9)
• dma_fence_unlock_irqrestore(9)
• dma_fence_assert_held(9)
• Safe external access to driver provided object members(9)
• dma_fence_is_signaled_locked(9)
• dma_fence_is_signaled(9)
• __dma_fence_is_later(9)
• dma_fence_is_later(9)
• dma_fence_is_later_or_same(9)
• dma_fence_later(9)
• dma_fence_get_status_locked(9)
• dma_fence_set_error(9)
• dma_fence_timestamp(9)
• dma_fence_is_array(9)
• dma_fence_is_chain(9)
• dma_fence_is_container(9)

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mwah 💋 that's the page! source path ./include/linux, date October 2026, manual page dma_fence_wait(9) — slay and wait responsibly 💖