dmaengine: coh901318: Only calculate residue if txstate exists.

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>

diff --git a/drivers/dma/coh901318.c b/drivers/dma/coh901318.c
index c340ca9bd2b5dc953e6373f85314714836f8cf83..c1006165cea81f09311a9e9a86e1ffe59e6dcf15 100644 (file)
--- a/drivers/dma/coh901318.c
+++ b/drivers/dma/coh901318.c
@@ -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));