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[7/8] dmaengine: tegra20-apb-dma: Only calculate residue if txstate exists.

Message ID 1465321121-22238-8-git-send-email-peter.griffin@linaro.org
State Accepted
Commit 71f7e6cc55003ca6f616ff4094253d28de5d9254
Headers show

Commit Message

Peter Griffin June 7, 2016, 5:38 p.m. UTC 
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>

---
 drivers/dma/tegra20-apb-dma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

-- 
1.9.1
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Patch

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 @@  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);