[RFC 02/34] dmaengine: virt-dma: vchan_find_desc()
From: Russell King <hidden>
Date: 2012-05-29 09:35:58
Subsystem:
dma generic offload engine subsystem, the rest · Maintainers:
Vinod Koul, Linus Torvalds
Add a function to find a descriptor within the depths of the virtualized DMA channel support. Needed for tx_status functionality. Signed-off-by: Russell King <redacted> --- drivers/dma/virt-dma.c | 13 +++++++++++++ drivers/dma/virt-dma.h | 2 +- 2 files changed, 14 insertions(+), 1 deletions(-)
diff --git a/drivers/dma/virt-dma.c b/drivers/dma/virt-dma.c
index bd85b05..a8054fc 100644
--- a/drivers/dma/virt-dma.c
+++ b/drivers/dma/virt-dma.c@@ -39,6 +39,19 @@ dma_cookie_t vchan_tx_submit(struct dma_async_tx_descriptor *tx) } EXPORT_SYMBOL_GPL(vchan_tx_submit); +struct virt_dma_desc *vchan_find_desc(struct virt_dma_chan *vc, + dma_cookie_t cookie) +{ + struct virt_dma_desc *vd; + + list_for_each_entry(vd, &vc->desc_issued, node) + if (vd->tx.cookie == cookie) + return vd; + + return NULL; +} +EXPORT_SYMBOL_GPL(vchan_find_desc); + /* * This tasklet handles the completion of a DMA descriptor by * calling its callback and freeing it.
diff --git a/drivers/dma/virt-dma.h b/drivers/dma/virt-dma.h
index 825bb96..44ec57e 100644
--- a/drivers/dma/virt-dma.h
+++ b/drivers/dma/virt-dma.h@@ -40,8 +40,8 @@ static inline struct virt_dma_chan *to_virt_chan(struct dma_chan *chan) } void vchan_dma_desc_free_list(struct virt_dma_chan *vc, struct list_head *head); - void vchan_init(struct virt_dma_chan *vc, struct dma_device *dmadev); +struct virt_dma_desc *vchan_find_desc(struct virt_dma_chan *, dma_cookie_t); /** * vchan_tx_prep - prepare a descriptor
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1.7.4.4