[PATCH 14/19] dmaengine: add dma_sync_wait

[Dan Williams <dan.j.williams@intel.com>]

From: Dan Williams <dan.j.williams@intel.com>

dma_sync_wait is a common routine to live wait for a dma operation to
complete.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---

 include/linux/dmaengine.h |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 9fd6cbd..0a70c9e 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -750,6 +750,18 @@ static inline void dma_async_unmap_singl
 	chan->device->unmap_single(chan, handle, size, direction);
 }
 
+static inline enum dma_status dma_sync_wait(struct dma_chan *chan,
+						dma_cookie_t cookie)
+{
+	enum dma_status status;
+	dma_async_issue_pending(chan);
+	do {
+		status = dma_async_operation_complete(chan, cookie, NULL, NULL);
+	} while (status == DMA_IN_PROGRESS);
+
+	return status;
+}
+
 /* --- DMA device --- */
 
 int dma_async_device_register(struct dma_device *device);