5.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Takashi Iwai <tiwai@xxxxxxx>
commit 7d50b295c4af16f814ee82369c4a234df5228801 upstream.
This reverts commit 3ad796cbc36a ("ALSA: pcm: Use SG-buffer only when
direct DMA is available") also the modification commit 467fd0e82b62
("ALSA: pcm: Fix build error on m68k and others").
Poking the DMA internal helper is a layer violation, so we should
avoid that. Meanwhile the actual bug has been addressed by the
Kconfig fix in commit dbed452a078d ("dma-pool: decouple DMA_REMAP from
DMA_COHERENT_POOL"), so we can live without this hack.
Link: https://lore.kernel.org/r/20200717064130.22957-1-tiwai@xxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/core/pcm_memory.c | 14 --------------
1 file changed, 14 deletions(-)
--- a/sound/core/pcm_memory.c
+++ b/sound/core/pcm_memory.c
@@ -11,7 +11,6 @@
#include <linux/moduleparam.h>
#include <linux/vmalloc.h>
#include <linux/export.h>
-#include <linux/dma-mapping.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/info.h>
@@ -66,19 +65,6 @@ static int do_alloc_pages(struct snd_car
__update_allocated_size(card, size);
mutex_unlock(&card->memory_mutex);
-
-#ifdef CONFIG_SND_DMA_SGBUF
- if ((type == SNDRV_DMA_TYPE_DEV_SG || type == SNDRV_DMA_TYPE_DEV_UC_SG) &&
- !dma_is_direct(get_dma_ops(dev))) {
- /* mutate to continuous page allocation */
- dev_dbg(dev, "Use continuous page allocator\n");
- if (type == SNDRV_DMA_TYPE_DEV_SG)
- type = SNDRV_DMA_TYPE_DEV;
- else
- type = SNDRV_DMA_TYPE_DEV_UC;
- }
-#endif /* CONFIG_SND_DMA_SGBUF */
-
err = snd_dma_alloc_pages(type, dev, size, dmab);
if (!err) {
/* the actual allocation size might be bigger than requested,
