From: Peter Griffin <peter.griffin@linaro.org>
Date: Tue, 7 Jun 2016 17:38:39 +0000 (+0100)
Subject: dmaengine: sun6i-dma: Only calculate residue if state exists.
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=b9ab9d10d9898cd022fece44a474e5ddb785d639;p=openwrt%2Fstaging%2Fblogic.git

dmaengine: sun6i-dma: Only calculate residue if state exists.

There is no point in calculating the residue if state does not
exist to store the value.

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

diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
index 5065ca43face..3835fcde3545 100644
--- a/drivers/dma/sun6i-dma.c
+++ b/drivers/dma/sun6i-dma.c
@@ -865,7 +865,7 @@ static enum dma_status sun6i_dma_tx_status(struct dma_chan *chan,
 	size_t bytes = 0;
 
 	ret = dma_cookie_status(chan, cookie, state);
-	if (ret == DMA_COMPLETE)
+	if (ret == DMA_COMPLETE || !state)
 		return ret;
 
 	spin_lock_irqsave(&vchan->vc.lock, flags);