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drm/exynos: fix layering violation of address 

There is no guarantee that DMA addresses are the same as physical
addresses, but dma_to_pfn() knows how to convert a dma_addr_t to a PFN
which can then be converted to a struct page.

Suggested-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
This commit is contained in:
Joonyoung Shim 2015-09-16 14:16:45 +09:00 committed by Inki Dae
parent fd03420b56
commit 5e0fb1f9eb
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/exynos/exynos_drm_gem.c
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@ -77,7 +77,8 @@ static int exynos_drm_alloc_buf(struct exynos_drm_gem_obj *obj)
start_addr = obj->dma_addr;
while (i < nr_pages) {
obj->pages[i] = phys_to_page(start_addr);
obj->pages[i] = pfn_to_page(dma_to_pfn(dev->dev,
start_addr));
start_addr += PAGE_SIZE;
i++;
}