1 files changed, 13 insertions, 0 deletions

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.