[PATCH] drm/radeon: do not try to uselessly update virtual memory pagetable

[j.glisse at gmail.com]

From: Jerome Glisse <jglisse at redhat.com>

If a buffer is never bind to a virtual memory pagetable than don't try
to unbind it. Only drawback is that we don't update the pagetable when
unbinding the ib pool buffer which is fine because it only happens at
suspend or module unload/shutdown.

Cc: stable at kernel.org
Signed-off-by: Jerome Glisse <jglisse at redhat.com>
---
 drivers/gpu/drm/radeon/radeon_gart.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_gart.c b/drivers/gpu/drm/radeon/radeon_gart.c
index 6e24f84..daf9710 100644
--- a/drivers/gpu/drm/radeon/radeon_gart.c
+++ b/drivers/gpu/drm/radeon/radeon_gart.c
@@ -1209,11 +1209,13 @@ int radeon_vm_bo_update_pte(struct radeon_device *rdev,
 int radeon_vm_bo_rmv(struct radeon_device *rdev,
 		     struct radeon_bo_va *bo_va)
 {
-	int r;
+	int r = 0;
 
 	mutex_lock(&rdev->vm_manager.lock);
 	mutex_lock(&bo_va->vm->mutex);
-	r = radeon_vm_bo_update_pte(rdev, bo_va->vm, bo_va->bo, NULL);
+	if (bo_va->soffset) {
+		r = radeon_vm_bo_update_pte(rdev, bo_va->vm, bo_va->bo, NULL);
+	}
 	mutex_unlock(&rdev->vm_manager.lock);
 	list_del(&bo_va->vm_list);
 	mutex_unlock(&bo_va->vm->mutex);
-- 
1.7.11.7