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: f2e3d55397ff ("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>

diff --git a/arch/arc/mm/dma.c b/arch/arc/mm/dma.c
index 73d7e4c75b7dbc9140604b334ab5e22a8cdd7a8d..ab74b5d9186c918b8ec4407b78958a2d208985d0 100644 (file)
--- a/arch/arc/mm/dma.c
+++ b/arch/arc/mm/dma.c
@@ -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) ||