5.4-stable review patch. If anyone has any objections, please let me know.
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From: Takashi Iwai tiwai@suse.de
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@suse.de Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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,