This is a note to let you know that I've just added the patch titled
drm/ttm: Fix accesses through vmas with only partial coverage
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-ttm-fix-accesses-through-vmas-with-only-partial-coverage.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d386735588c3e22129c2bc6eb64fc1d37a8f805c Mon Sep 17 00:00:00 2001
From: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Date: Sun, 8 Dec 2013 23:23:57 -0800
Subject: drm/ttm: Fix accesses through vmas with only partial coverage
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -116,9 +116,9 @@ static int ttm_bo_vm_fault(struct vm_are
}
page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) +
- drm_vma_node_start(&bo->vma_node) - vma->vm_pgoff;
- page_last = vma_pages(vma) +
- drm_vma_node_start(&bo->vma_node) - vma->vm_pgoff;
+ vma->vm_pgoff - drm_vma_node_start(&bo->vma_node);
+ page_last = vma_pages(vma) + vma->vm_pgoff -
+ drm_vma_node_start(&bo->vma_node);
if (unlikely(page_offset >= bo->num_pages)) {
retval = VM_FAULT_SIGBUS;
Patches currently in stable-queue which might be from thellstrom@xxxxxxxxxx are
queue-3.12/drm-ttm-fix-accesses-through-vmas-with-only-partial-coverage.patch
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