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authorAkinobu Mita <akinobu.mita@gmail.com>2014-06-04 16:06:56 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-04 16:53:57 -0700
commit38f7ea5a082bbde9e64b7ece389f20e71a9806f4 (patch)
treee79be3a23b0b5bc492056b4d1566d9e5eeb8780f /arch
parent5ea3b1b2f8ad9162684431ce6188102ca4c64b7a (diff)
arch/x86/kernel/pci-dma.c: fix dma_generic_alloc_coherent() when CONFIG_DMA_CMA is enabled
dma_generic_alloc_coherent() firstly attempts to allocate by dma_alloc_from_contiguous() if CONFIG_DMA_CMA is enabled. But the memory region allocated by it may not fit within the device's DMA mask. This change makes it fall back to usual alloc_pages_node() allocation for such cases. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Don Dutile <ddutile@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/pci-dma.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index e5f4e9629e61..a25e202bb319 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -101,8 +101,13 @@ void *dma_generic_alloc_coherent(struct device *dev, size_t size,
again:
page = NULL;
/* CMA can be used only in the context which permits sleeping */
- if (flag & __GFP_WAIT)
+ if (flag & __GFP_WAIT) {
page = dma_alloc_from_contiguous(dev, count, get_order(size));
+ if (page && page_to_phys(page) + size > dma_mask) {
+ dma_release_from_contiguous(dev, page, count);
+ page = NULL;
+ }
+ }
/* fallback */
if (!page)
page = alloc_pages_node(dev_to_node(dev), flag, get_order(size));