From: Takashi Iwai <tiwai@suse.de>
Date: Wed, 30 Jul 2008 13:13:33 +0000 (+0200)
Subject: ALSA: Fix allocation size calculation in snd_dma_alloc_pages_fallback()
X-Git-Tag: firefly_0821_release~16888^2~210
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=4e184f8fc06411f35fdcf4b9bc6187c857bf7214;p=firefly-linux-kernel-4.4.55.git

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 f0c3b1d6da81..a7b46ec72f32 100644
--- a/sound/core/memalloc.c
+++ b/sound/core/memalloc.c
@@ -277,11 +277,16 @@ int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
 	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;