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dma-mapping fixes for Linux 6.2

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Fix up the sound code to not pass __GFP_COMP to the non-coherent DMA
 allocator, as it copes with that just as badly as the coherent allocator,
 and then add a check to make sure no one passes the flag ever again.
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Merge tag 'dma-mapping-2022-12-23' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping fixes from Christoph Hellwig:
 "Fix up the sound code to not pass __GFP_COMP to the non-coherent DMA
  allocator, as it copes with that just as badly as the coherent
  allocator, and then add a check to make sure no one passes the flag
  ever again"

* tag 'dma-mapping-2022-12-23' of git://git.infradead.org/users/hch/dma-mapping:
  dma-mapping: reject GFP_COMP for noncoherent allocations
  ALSA: memalloc: don't use GFP_COMP for non-coherent dma allocations
This commit is contained in:
Linus Torvalds 2022-12-23 11:44:20 -08:00
commit 59d2c635f6
2 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
kernel/dma/mapping.c
View File

@ -560,6 +560,8 @@ static struct page *__dma_alloc_pages(struct device *dev, size_t size,
return NULL;
if (WARN_ON_ONCE(gfp & (__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM)))
return NULL;
if (WARN_ON_ONCE(gfp & __GFP_COMP))
return NULL;
size = PAGE_ALIGN(size);
if (dma_alloc_direct(dev, ops))
@ -645,6 +647,8 @@ struct sg_table *dma_alloc_noncontiguous(struct device *dev, size_t size,
if (WARN_ON_ONCE(attrs & ~DMA_ATTR_ALLOC_SINGLE_PAGES))
return NULL;
if (WARN_ON_ONCE(gfp & __GFP_COMP))
return NULL;
if (ops && ops->alloc_noncontiguous)
sgt = ops->alloc_noncontiguous(dev, size, dir, gfp, attrs);

4
sound/core/memalloc.c
View File

@ -542,7 +542,7 @@ static void *snd_dma_noncontig_alloc(struct snd_dma_buffer *dmab, size_t size)
void *p;
sgt = dma_alloc_noncontiguous(dmab->dev.dev, size, dmab->dev.dir,
DEFAULT_GFP | __GFP_COMP, 0);
DEFAULT_GFP, 0);
#ifdef CONFIG_SND_DMA_SGBUF
if (!sgt && !get_dma_ops(dmab->dev.dev)) {
if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG)
@ -820,7 +820,7 @@ static void *snd_dma_noncoherent_alloc(struct snd_dma_buffer *dmab, size_t size)
void *p;
p = dma_alloc_noncoherent(dmab->dev.dev, size, &dmab->addr,
dmab->dev.dir, DEFAULT_GFP | __GFP_COMP);
dmab->dev.dir, DEFAULT_GFP);
if (p)
dmab->dev.need_sync = dma_need_sync(dmab->dev.dev, dmab->addr);
return p;