[PATCH] ARM: DMA: Fix kzalloc flags in __iommu_alloc_buffer()

[Alexandre Courbot]

There doesn't seem to be any valid reason to allocate the pages array
with the same flags as the buffer itself. Doing so can eventually lead
to the following safeguard in mm/slab.c to be hit:

BUG_ON(flags & GFP_SLAB_BUG_MASK);

This happens when buffers are allocated with __GFP_DMA32 or
__GFP_HIGHMEM.

Fix this by allocating the pages array with GFP_KERNEL to follow what is
done elsewhere in this file. Using GFP_KERNEL in __iommu_alloc_buffer()
is safe because atomic allocations are handled by __iommu_alloc_atomic().

Signed-off-by: Alexandre Courbot <acourbot at nvidia.com>
Cc: Russell King <linux at arm.linux.org.uk>
Cc: Marek Szyprowski <m.szyprowski at samsung.com>
Cc: Arnd Bergmann <arnd at arndb.de>
Cc: Thierry Reding <treding at nvidia.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk at oracle.com>
---
 arch/arm/mm/dma-mapping.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index e8907117861e..bc495354c802 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1106,7 +1106,7 @@ static struct page **__iommu_alloc_buffer(struct device *dev, size_t size,
 	int i = 0;
 
 	if (array_size <= PAGE_SIZE)
-		pages = kzalloc(array_size, gfp);
+		pages = kzalloc(array_size, GFP_KERNEL);
 	else
 		pages = vzalloc(array_size);
 	if (!pages)
-- 
2.1.3