Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes...

[pandora-kernel.git] / sound / arm / pxa2xx-pcm-lib.c

diff --git a/sound/arm/pxa2xx-pcm-lib.c b/sound/arm/pxa2xx-pcm-lib.c
index fd51fa8..76e0d56 100644 (file)
--- a/sound/arm/pxa2xx-pcm-lib.c
+++ b/sound/arm/pxa2xx-pcm-lib.c
@@ -4,6 +4,7 @@
  * published by the Free Software Foundation.
  */
 
+#include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/dma-mapping.h>
 
@@ -139,6 +140,9 @@ int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
        if (!prtd || !prtd->params)
                return 0;
 
+       if (prtd->dma_ch == -1)
+               return -EINVAL;
+
        DCSR(prtd->dma_ch) &= ~DCSR_RUN;
        DCSR(prtd->dma_ch) = 0;
        DCMD(prtd->dma_ch) = 0;