ALSA: Fix allocation size calculation in snd_dma_alloc_pages_fallback()
snd_dma_alloc_pages_fallback() always tries to reduce the size in a half,
but it's not good when the given size isn't a power-of-two.
Check it first then try to align.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c
index f0c3b1d..a7b46ec 100644
--- a/sound/core/memalloc.c
+++ b/sound/core/memalloc.c
@@ -277,11 +277,16 @@
int err;
while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
+ size_t aligned_size;
if (err != -ENOMEM)
return err;
- size >>= 1;
if (size <= PAGE_SIZE)
return -ENOMEM;
+ aligned_size = PAGE_SIZE << get_order(size);
+ if (size != aligned_size)
+ size = aligned_size;
+ else
+ size >>= 1;
}
if (! dmab->area)
return -ENOMEM;
