linux-kernel - [PATCH 14/19] dmaengine: add dma_sync

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Date:	Mon, 11 Sep 2006 16:18:49 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	neilb@...e.de, linux-raid@...r.kernel.org
Cc:	akpm@...l.org, linux-kernel@...r.kernel.org,
	christopher.leech@...el.com
Subject: [PATCH 14/19] dmaengine: add dma_sync_wait

From: Dan Williams <dan.j.williams@...el.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@...el.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);
-
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