-EDEADLK has special meaning in atomic, but get_fence may call
i915_find_fence_reg which can return -EDEADLK.
This has special meaning in the atomic world, so convert the error
to -EBUSY for this case.
Changes since v1:
- Add comment in the code.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
---
Like this?
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index af0bcfee4771..11387f5ed681 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2395,8 +2395,20 @@ intel_pin_and_fence_fb_obj(struct drm_plane *plane,
* a fence as the cost is not that onerous.
*/
ret = i915_gem_object_get_fence(obj);
- if (ret)
+ if (ret) {
+ if (ret == -EDEADLK) {
+ /*
+ * -EDEADLK means there are no free fences
+ * and no pending flips.
+ *
+ * This is propagated to atomic, but it uses
+ * -EDEADLK to force a locking recovery, so
+ * change the returned error to -EBUSY.
+ */
+ ret = -EBUSY;
+ }
goto err_unpin;
+ }
i915_gem_object_pin_fence(obj);
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