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dmaengine: coh901318: Only calculate residue if txstate exists.

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

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Peter Griffin 2016-06-07 18:38:36 +01:00 committed by Vinod Koul
parent a86144da9d
commit 95b0aa3e10
1 changed files with 1 additions and 1 deletions
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2
drivers/dma/coh901318.c
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@ -2422,7 +2422,7 @@ coh901318_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
enum dma_status ret;
ret = dma_cookie_status(chan, cookie, txstate);
if (ret == DMA_COMPLETE)
if (ret == DMA_COMPLETE || !txstate)
return ret;
dma_set_residue(txstate, coh901318_get_bytes_left(chan));