Hold onto the vm->mutex (to lock the drm_mm) to ensure that the rbtree
is table as we search it for our scratch node.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
index 130c4c522686..375d864736f3 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
@@ -1465,9 +1465,12 @@ static int igt_ctx_readonly(void *arg)
static int check_scratch(struct i915_address_space *vm, u64 offset)
{
- struct drm_mm_node *node =
- __drm_mm_interval_first(&vm->mm,
- offset, offset + sizeof(u32) - 1);
+ struct drm_mm_node *node;
+
+ mutex_lock(&vm->mutex);
+ node = __drm_mm_interval_first(&vm->mm,
+ offset, offset + sizeof(u32) - 1);
+ mutex_unlock(&vm->mutex);
if (!node || node->start > offset)
return 0;
--
2.25.0
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