3.11.10.6 -stable review patch.  If anyone has any objections, please let me 
know.

------------------

From: =?UTF-8?q?Christian=20K=C3=B6nig?= <[email protected]>

commit 5e386b574cf7e1593e1296e5b0feea4108ed6ad8 upstream.

Otherwise we might get a crash here.

Signed-off-by: Christian König <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Signed-off-by: Luis Henriques <[email protected]>
---
 drivers/gpu/drm/radeon/radeon_kms.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/radeon/radeon_kms.c 
b/drivers/gpu/drm/radeon/radeon_kms.c
index cc2ca38..42ff84b 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -504,6 +504,10 @@ int radeon_driver_open_kms(struct drm_device *dev, struct 
drm_file *file_priv)
 
                radeon_vm_init(rdev, &fpriv->vm);
 
+               r = radeon_bo_reserve(rdev->ring_tmp_bo.bo, false);
+               if (r)
+                       return r;
+
                /* map the ib pool buffer read only into
                 * virtual address space */
                bo_va = radeon_vm_bo_add(rdev, &fpriv->vm,
@@ -511,6 +515,8 @@ int radeon_driver_open_kms(struct drm_device *dev, struct 
drm_file *file_priv)
                r = radeon_vm_bo_set_addr(rdev, bo_va, RADEON_VA_IB_OFFSET,
                                          RADEON_VM_PAGE_READABLE |
                                          RADEON_VM_PAGE_SNOOPED);
+
+               radeon_bo_unreserve(rdev->ring_tmp_bo.bo);
                if (r) {
                        radeon_vm_fini(rdev, &fpriv->vm);
                        kfree(fpriv);
-- 
1.9.0

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