ALSA: core: Don't allow NULL device for memory allocation

Since we covered all callers with NULL device pointer, let's catch the
remaining calls with NULL and warn explicitly.

Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c
index 59a4adc..eb97423 100644 (file)
--- a/sound/core/memalloc.c
+++ b/sound/core/memalloc.c
@@ -182,6 +182,8 @@ int snd_dma_alloc_pages(int type, struct device *device, size_t size,
                return -ENXIO;
        if (WARN_ON(!dmab))
                return -ENXIO;
+       if (WARN_ON(!device))
+               return -EINVAL;
 
        dmab->dev.type = type;
        dmab->dev.dev = device;