From fe045874aaf4480386c65baf1acae82af4c5e21f Mon Sep 17 00:00:00 2001 From: Russell King Date: Thu, 10 May 2012 23:39:27 +0100 Subject: dmaengine: virt-dma: vchan_find_desc() Add a function to find a descriptor within the depths of the virtualized DMA channel support. Needed for tx_status functionality. Tested-by: Linus Walleij Signed-off-by: Russell King --- drivers/dma/virt-dma.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'drivers/dma/virt-dma.c') diff --git a/drivers/dma/virt-dma.c b/drivers/dma/virt-dma.c index bd85b052b481..a8054fc40cef 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. -- cgit