x86: fix nommu_alloc_coherent allocation with NULL device argument

We need to use __GFP_DMA for NULL device argument (fallback_dev) with
pci-nommu. It's a hack for ISA (and some old code) so we need to use
GFP_DMA.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1 insertions, 2 deletions

diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c
index 0f51883cc6a8..ada1c87cafc2 100644
--- a/arch/x86/kernel/pci-nommu.c
+++ b/arch/x86/kernel/pci-nommu.c
@@ -80,7 +80,6 @@ nommu_alloc_coherent(struct device *hwdev, size_t size,
         int node;
         struct page *page;
 
-        gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
         gfp |= __GFP_ZERO;
 
         dma_mask = hwdev->coherent_dma_mask;
@@ -93,7 +92,7 @@ nommu_alloc_coherent(struct device *hwdev, size_t size,
         node = dev_to_node(hwdev);
 
 #ifdef CONFIG_X86_64
-        if (dma_mask <= DMA_32BIT_MASK)
+        if (dma_mask <= DMA_32BIT_MASK && !(gfp & GFP_DMA))
                 gfp |= GFP_DMA32;
 #endif