Commit b4dff287 authored Jul 03, 2016 by Vladimir Kondratiev Committed by Vineet Gupta Jul 20, 2016

ARC: dma: fix address translation in arc_dma_free



page should be calculated using physical address.
If platform uses non-trivial dma-to-phys memory translation,
dma_handle should be converted to physicval address before
calculation of page.

Failing to do so results in struct page * pointing to
wrong or non-existent memory.

Fixes: f2e3d553 ("ARC: dma: reintroduce platform specific dma<->phys")
Cc: stable@vger.kernel.org #4.6+
Signed-off-by: Vladimir Kondratiev <vladimir.kondratiev@intel.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

parent 627c88b6

arch/arc/mm/dma.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -92,7 +92,8 @@ static void arc_dma_alloc(struct device dev, size_t size,
		static void arc_dma_free(struct device dev, size_t size, void vaddr,
		dma_addr_t dma_handle, struct dma_attrs *attrs)
		{
		struct page *page = virt_to_page(dma_handle);
		phys_addr_t paddr = plat_dma_to_phys(dev, dma_handle);
		struct page *page = virt_to_page(paddr);
		int is_non_coh = 1;

		is_non_coh = dma_get_attr(DMA_ATTR_NON_CONSISTENT, attrs) \|\|

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