dmaengine: remove DMA unmap from drivers

Remove support for DMA unmapping from drivers as it is no longer
needed (DMA core code is now handling it).

Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Tomasz Figa <t.figa@samsung.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
[djbw: fix up chan2parent() unused warning in drivers/dma/dw/core.c]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 0 insertions, 29 deletions

diff --git a/drivers/dma/ep93xx_dma.c b/drivers/dma/ep93xx_dma.c
index dcd6bf5d3091..cb4bf682a708 100644
--- a/drivers/dma/ep93xx_dma.c
+++ b/drivers/dma/ep93xx_dma.c
@@ -733,28 +733,6 @@ static void ep93xx_dma_advance_work(struct ep93xx_dma_chan *edmac)
         spin_unlock_irqrestore(&edmac->lock, flags);
 }
 
-static void ep93xx_dma_unmap_buffers(struct ep93xx_dma_desc *desc)
-{
-        struct device *dev = desc->txd.chan->device->dev;
-
-        if (!(desc->txd.flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
-                if (desc->txd.flags & DMA_COMPL_SRC_UNMAP_SINGLE)
-                        dma_unmap_single(dev, desc->src_addr, desc->size,
-                                         DMA_TO_DEVICE);
-                else
-                        dma_unmap_page(dev, desc->src_addr, desc->size,
-                                       DMA_TO_DEVICE);
-        }
-        if (!(desc->txd.flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
-                if (desc->txd.flags & DMA_COMPL_DEST_UNMAP_SINGLE)
-                        dma_unmap_single(dev, desc->dst_addr, desc->size,
-                                         DMA_FROM_DEVICE);
-                else
-                        dma_unmap_page(dev, desc->dst_addr, desc->size,
-                                       DMA_FROM_DEVICE);
-        }
-}
-
 static void ep93xx_dma_tasklet(unsigned long data)
 {
         struct ep93xx_dma_chan *edmac = (struct ep93xx_dma_chan *)data;
@@ -787,14 +765,7 @@ static void ep93xx_dma_tasklet(unsigned long data)
 
         /* Now we can release all the chained descriptors */
         list_for_each_entry_safe(desc, d, &list, node) {
-                /*
-                 * For the memcpy channels the API requires us to unmap the
-                 * buffers unless requested otherwise.
-                 */
                 dma_descriptor_unmap(&desc->txd);
-                if (!edmac->chan.private)
-                        ep93xx_dma_unmap_buffers(desc);
-
                 ep93xx_dma_desc_put(edmac, desc);
         }