drm/radeon: fix userptr lockup

We shouldn't try to reserve and wait for a BO that isn't bound. Otherwise
we can run into a deadlock if we have a fault during binding the BO.

Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/radeon/radeon_mn.c b/drivers/gpu/drm/radeon/radeon_mn.c
index 535bf404b725f8aea3f58ddcb5a082b992212329..eef006c4858499dd207c6eb70ad5fcbc05c53941 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_mn.c
+++ b/drivers/gpu/drm/radeon/radeon_mn.c
@@ -142,6 +142,9 @@ static void radeon_mn_invalidate_range_start(struct mmu_notifier *mn,
 
                list_for_each_entry(bo, &node->bos, mn_list) {
 
+                       if (!bo->tbo.ttm || bo->tbo.ttm->state != tt_bound)
+                               continue;
+
                        r = radeon_bo_reserve(bo, true);
                        if (r) {
                                DRM_ERROR("(%ld) failed to reserve user bo\n", r);