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drm/exynos: fixed exynos_drm_gem_map_pages bug. 

this patch fixes the problem that the physical memory region to be mapped
to user space could be exceeded. if page fault address was placed at between
buffer start and end then memory region to be mapped would be exceeded.

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
This commit is contained in:
Inki Dae 2012-04-23 19:41:14 +09:00
parent 887ea3db26
commit f6ead8dea5
1 changed files with 3 additions and 13 deletions
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16
drivers/gpu/drm/exynos/exynos_drm_gem.c
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@ -149,22 +149,12 @@ static int exynos_drm_gem_map_pages(struct drm_gem_object *obj,
unsigned long pfn;
if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
unsigned long usize = buf->size;
if (!buf->pages)
return -EINTR;
while (usize > 0) {
pfn = page_to_pfn(buf->pages[page_offset++]);
vm_insert_mixed(vma, f_vaddr, pfn);
f_vaddr += PAGE_SIZE;
usize -= PAGE_SIZE;
}
return 0;
}
pfn = (buf->dma_addr >> PAGE_SHIFT) + page_offset;
pfn = page_to_pfn(buf->pages[page_offset++]);
} else
pfn = (buf->dma_addr >> PAGE_SHIFT) + page_offset;
return vm_insert_mixed(vma, f_vaddr, pfn);
}