[PATCH 1/4 v2] dmaengine: add a tx_free method to struct dma_async_tx_descriptor
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STALE6512d
From: Guennadi Liakhovetski <hidden>
Date: 2008-12-10 10:36:25
Also in:
lkml
Subsystem:
dma generic offload engine subsystem, the rest · Maintainers:
Vinod Koul, Linus Torvalds
From: Guennadi Liakhovetski <redacted> Some users reuse DMA transaction descriptors multiple times and need an explicit call to release them. An example of such a user is Video4Linux, which has to be able to release descriptors on ioctl(VIDIOC_DQBUF). Signed-off-by: Guennadi Liakhovetski <redacted> --- include/linux/dmaengine.h | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 64dea2a..58b2268 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h@@ -183,6 +183,7 @@ typedef void (*dma_async_tx_callback)(void *dma_async_param); * descriptors * @chan: target channel for this operation * @tx_submit: set the prepared descriptor(s) to be executed by the engine + * @tx_free: release a transaction descriptor * @callback: routine to call after this operation is complete * @callback_param: general parameter to pass to the callback routine * ---async_tx api specific fields---
@@ -197,6 +198,7 @@ struct dma_async_tx_descriptor { struct list_head tx_list; struct dma_chan *chan; dma_cookie_t (*tx_submit)(struct dma_async_tx_descriptor *tx); + void (*tx_free)(struct dma_async_tx_descriptor *tx); dma_async_tx_callback callback; void *callback_param; struct dma_async_tx_descriptor *next;
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1.5.4