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Subject[PATCH 5/8] dma-direct: factor out a dma_direct_alloc_from_pool helper
Date
This ensures dma_direct_alloc_pages will use the right gfp mask, as
well as keeping the code for that common.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
kernel/dma/direct.c | 41 ++++++++++++++++++++---------------------
1 file changed, 20 insertions(+), 21 deletions(-)

diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index b5d56810130b22..ace9159c992f65 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -147,6 +147,22 @@ static struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
return page;
}

+static void *dma_direct_alloc_from_pool(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t gfp)
+{
+ struct page *page;
+ u64 phys_mask;
+ void *ret;
+
+ gfp |= dma_direct_optimal_gfp_mask(dev, dev->coherent_dma_mask,
+ &phys_mask);
+ page = dma_alloc_from_pool(dev, size, &ret, gfp, dma_coherent_ok);
+ if (!page)
+ return NULL;
+ *dma_handle = phys_to_dma_direct(dev, page_to_phys(page));
+ return ret;
+}
+
void *dma_direct_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
{
@@ -163,17 +179,8 @@ void *dma_direct_alloc(struct device *dev, size_t size,
if (attrs & DMA_ATTR_NO_WARN)
gfp |= __GFP_NOWARN;

- if (dma_should_alloc_from_pool(dev, gfp, attrs)) {
- u64 phys_mask;
-
- gfp |= dma_direct_optimal_gfp_mask(dev, dev->coherent_dma_mask,
- &phys_mask);
- page = dma_alloc_from_pool(dev, size, &ret, gfp,
- dma_coherent_ok);
- if (!page)
- return NULL;
- goto done;
- }
+ if (dma_should_alloc_from_pool(dev, gfp, attrs))
+ return dma_direct_alloc_from_pool(dev, size, dma_handle, gfp);

/* we always manually zero the memory once we are done */
page = __dma_direct_alloc_pages(dev, size, gfp & ~__GFP_ZERO);
@@ -297,15 +304,8 @@ struct page *dma_direct_alloc_pages(struct device *dev, size_t size,
{
struct page *page;

- if (dma_should_alloc_from_pool(dev, gfp, 0)) {
- void *ret;
-
- page = dma_alloc_from_pool(dev, size, &ret, gfp,
- dma_coherent_ok);
- if (!page)
- return NULL;
- goto done;
- }
+ if (dma_should_alloc_from_pool(dev, gfp, 0))
+ return dma_direct_alloc_from_pool(dev, size, dma_handle, gfp);

page = __dma_direct_alloc_pages(dev, size, gfp | __GFP_ZERO);
if (!page)
@@ -326,7 +326,6 @@ struct page *dma_direct_alloc_pages(struct device *dev, size_t size,
1 << get_order(size)))
goto out_free_pages;
}
-done:
*dma_handle = phys_to_dma_direct(dev, page_to_phys(page));
return page;
out_free_pages:
--
2.28.0
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