diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 9e56745..5932ab1 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -504,6 +504,32 @@
 }
 
 /**
+ * dma_request_channel - try to get specific channel exclusively
+ * @chan: target channel
+ */
+struct dma_chan *dma_get_slave_channel(struct dma_chan *chan)
+{
+	int err = -EBUSY;
+
+	/* lock against __dma_request_channel */
+	mutex_lock(&dma_list_mutex);
+
+	if (chan->client_count == 0)
+		err = dma_chan_get(chan);
+	else
+		chan = NULL;
+
+	mutex_unlock(&dma_list_mutex);
+
+	if (err)
+		pr_debug("%s: failed to get %s: (%d)\n",
+			__func__, dma_chan_name(chan), err);
+
+	return chan;
+}
+EXPORT_SYMBOL_GPL(dma_get_slave_channel);
+
+/**
  * dma_request_channel - try to allocate an exclusive channel
  * @mask: capabilities that the channel must satisfy
  * @fn: optional callback to disposition available channels