commit 9d1400cf79afb49584b4873eb22cd5130cb341db upstream.
Atomic pool should always be allocated from DMA zone if such zone is
available in the system to avoid issues caused by limited dma mask of
any of the devices used for making an atomic allocation.
Reported-by: Krzysztof Halasa <khc@xxxxxxxxx>
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Stable <stable@xxxxxxxxxxxxxxx> [v3.6+]
---
Hello,
This is a backported version of mainline 9d1400cf79afb49584b commit.
It should apply fine to v3.8.y, v3.7.y and v3.6.y stable kernel trees.
Best regards
Marek Szyprowski
Samsung Poland R&D Center
---
arch/arm/mm/dma-mapping.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index dda3904..5397da0 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -330,6 +330,7 @@ static int __init atomic_pool_init(void)
{
struct dma_pool *pool = &atomic_pool;
pgprot_t prot = pgprot_dmacoherent(pgprot_kernel);
+ gfp_t gfp = GFP_KERNEL | GFP_DMA;
unsigned long nr_pages = pool->size >> PAGE_SHIFT;
unsigned long *bitmap;
struct page *page;
@@ -348,8 +349,8 @@ static int __init atomic_pool_init(void)
if (IS_ENABLED(CONFIG_CMA))
ptr = __alloc_from_contiguous(NULL, pool->size, prot, &page);
else
- ptr = __alloc_remap_buffer(NULL, pool->size, GFP_KERNEL, prot,
- &page, NULL);
+ ptr = __alloc_remap_buffer(NULL, pool->size, gfp, prot, &page,
+ NULL);
if (ptr) {
int i;
--
1.7.9.5
--
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