ASoC: Fix pxa2xx-pcm checks for invalid DMA channels

Set the invalid dma channel to -1 (and check properly for it) in
pxa2xx_pcm_hw_free().  Was assuming 0 is an invalid channel number but 0
is a valid pxa dma channel num.

Signed-off-by: stephen <stephen.ware@eqware.net>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/sound/soc/pxa/pxa2xx-pcm.c b/sound/soc/pxa/pxa2xx-pcm.c
index c670d08..53b9fb1 100644 (file)
--- a/sound/soc/pxa/pxa2xx-pcm.c
+++ b/sound/soc/pxa/pxa2xx-pcm.c
@@ -61,9 +61,9 @@ static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
 
        __pxa2xx_pcm_hw_free(substream);
 
-       if (prtd->dma_ch) {
+       if (prtd->dma_ch >= 0) {
                pxa_free_dma(prtd->dma_ch);
-               prtd->dma_ch = 0;
+               prtd->dma_ch = -1;
        }
 
        return 0;