dmaengine: xgene-dma: move unmap to before callback

Completion callback should happen after dma_descriptor_unmap() has
happened. This allow the cache invalidate to happen and ensure that
the data accessed by the upper layer is in memory that was from DMA
rather than stale data. On some architecture this is done by the
hardware, however we should make the code consistent to not cause
confusion.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Cc: Rameshwar Prasad Sahu <rsahu@apm.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/xgene-dma.c b/drivers/dma/xgene-dma.c
index d66ed11baaeca84d7578da34a5c994fe91522dd6..8b693b712d0f7a09e8ccd7975280024171a18be2 100644 (file)
--- a/drivers/dma/xgene-dma.c
+++ b/drivers/dma/xgene-dma.c
@@ -606,12 +606,11 @@ static void xgene_dma_run_tx_complete_actions(struct xgene_dma_chan *chan,
                return;
 
        dma_cookie_complete(tx);
+       dma_descriptor_unmap(tx);
 
        /* Run the link descriptor callback function */
        dmaengine_desc_get_callback_invoke(tx, NULL);
 
-       dma_descriptor_unmap(tx);
-
        /* Run any dependencies */
        dma_run_dependencies(tx);
 }