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

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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>
This commit is contained in:
Peter Griffin 2016-06-07 18:38:40 +01:00 committed by Vinod Koul
parent b9ab9d10d9
commit 71f7e6cc55
1 changed files with 1 additions and 1 deletions
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2
drivers/dma/tegra20-apb-dma.c
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@ -814,7 +814,7 @@ static enum dma_status tegra_dma_tx_status(struct dma_chan *dc,
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);