[RFC patch resend] DMA engine/Langwell: process pending descriptors

[Hillf Danton]

Descriptors could be added onto the queue list, though pending descriptors are
checked in intel_mid_dma_issue_pending(), they are not processed by scanning
the queue list. Now it is added.

Signed-off-by: Hillf Danton <dhillf@xxxxxxxxx>
---

--- a/drivers/dma/intel_mid_dma.c	Sat Aug 13 11:44:46 2011
+++ intel_mid_dma.c	Sat Aug 13 11:52:35 2011
@@ -338,8 +338,12 @@ static void midc_scan_descriptors(struct
 		if (desc->status == DMA_IN_PROGRESS)
 			midc_descriptor_complete(midc, desc);
 	}
-	return;
+	list_for_each_entry_safe(desc, _desc, &midc->queue, desc_node) {
+		if (desc->status == DMA_IN_PROGRESS)
+			midc_descriptor_complete(midc, desc);
 	}
+}
+
 /**
  * midc_lli_fill_sg -		Helper function to convert
  *				SG list to Linked List Items.
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