From: Yoichi Yuasa <yu...@linux-mips.org>
It cannot map correctly if page fault begins from a intermediate address.
[The driver prefaults the mapping, so we need to work from the correct
base address not the faulting address otherwise the map appears offset by
the fault offset]
Signed-off-by: Yoichi Yuasa <yuasa at linux-mips.org>
Signed-off-by: Alan Cox <alan at linux.intel.com>
Cc: stable at kernel.org
---
drivers/gpu/drm/gma500/framebuffer.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/gpu/drm/gma500/framebuffer.c
b/drivers/gpu/drm/gma500/framebuffer.c
index 8fde0d9..b51b9b8 100644
--- a/drivers/gpu/drm/gma500/framebuffer.c
+++ b/drivers/gpu/drm/gma500/framebuffer.c
@@ -125,7 +125,7 @@ static int psbfb_vm_fault(struct vm_area_struct *vma,
struct vm_fault *vmf)
unsigned long phys_addr = (unsigned long)dev_priv->stolen_base;
page_num = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
- address = (unsigned long)vmf->virtual_address;
+ address = (unsigned long)vmf->virtual_address - (vmf->pgoff <<
PAGE_SHIFT);
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
