radeon: Stop the ttm workqueue while reclocking

The ttm bo workqueue may touch objects while we're reclocking, so make
sure it's blocked until we're done.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index c9390ea56f96..79d3336eede5 100644
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -460,9 +460,11 @@ bool radeon_pm_debug_check_in_vbl(struct radeon_device *rdev, bool finish)
 static void radeon_pm_idle_work_handler(struct work_struct *work)
 {
         struct radeon_device *rdev;
+        int resched;
         rdev = container_of(work, struct radeon_device,
                                 pm.idle_work.work);
 
+        resched = ttm_bo_lock_delayed_workqueue(&rdev->mman.bdev);
         mutex_lock(&rdev->ddev->struct_mutex);
         mutex_lock(&rdev->pm.mutex);
         if (rdev->pm.state == PM_STATE_ACTIVE) {
@@ -509,6 +511,7 @@ static void radeon_pm_idle_work_handler(struct work_struct *work)
         }
         mutex_unlock(&rdev->pm.mutex);
         mutex_unlock(&rdev->ddev->struct_mutex);
+        ttm_bo_unlock_delayed_workqueue(&rdev->mman.bdev, resched);
 
         queue_delayed_work(rdev->wq, &rdev->pm.idle_work,
                                         msecs_to_jiffies(RADEON_IDLE_LOOP_MS));