3.2.55-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
commit d386735588c3e22129c2bc6eb64fc1d37a8f805c upstream.
VMAs covering a bo but that didn't start at the same address space offset as
the bo they were mapping were incorrectly generating SEGFAULT errors in
the fault handler.
Reported-by: Joseph Dolinak <kanilo2@xxxxxxxxx>
Signed-off-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Reviewed-by: Jakob Bornecrantz <jakob@xxxxxxxxxx>
[bwh: Backported to 3.2: drm_vma_node_start() is open-coded;
vma_pages() was open-coded]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/ttm/ttm_bo_vm.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -144,9 +144,9 @@ static int ttm_bo_vm_fault(struct vm_are
}
page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) +
- bo->vm_node->start - vma->vm_pgoff;
- page_last = ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) +
- bo->vm_node->start - vma->vm_pgoff;
+ vma->vm_pgoff - bo->vm_node->start;
+ page_last = vma_pages(vma) + vma->vm_pgoff -
+ bo->vm_node->start;
if (unlikely(page_offset >= bo->num_pages)) {
retval = VM_FAULT_SIGBUS;
--
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