commit 71f7e6cc55003ca6f616ff4094253d28de5d9254
author Peter Griffin <peter.griffin@linaro.org> Tue Jun 07 18:38:40 2016 +0100
committer Vinod Koul <vinod.koul@intel.com> Tue Jun 21 21:35:00 2016 +0530
tree 0e97aa6bad67fb634836a688258ace0c294cf075
parent b9ab9d10d9898cd022fece44a474e5ddb785d639

dmaengine: tegra20-apb-dma: Only calculate residue if txstate exists.

There is no point calculating the residue if there is
no txstate to store the value.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/tegra20-apb-dma.c

diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index 01e316f..7f4af8c 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -814,7 +814,7 @@
 	unsigned int residual;
 
 	ret = dma_cookie_status(dc, cookie, txstate);
-	if (ret == DMA_COMPLETE)
+	if (ret == DMA_COMPLETE || !txstate)
 		return ret;
 
 	spin_lock_irqsave(&tdc->lock, flags);