sanitize_watermarks() does not properly handle errors returned by
drm_atomic_helper_duplicate_state(). EDEADLK should trigger a modeset
backoff and retry; for other errors we need to drop locks before
returning.
Cc: Daniel Vetter <dan...@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.ro...@intel.com>
---
I think this might fix the problems that blew up the CI system recently.
drivers/gpu/drm/i915/intel_display.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_display.c
index 391cc7f..fdff460 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -15316,8 +15316,13 @@ retry:
}
state = drm_atomic_helper_duplicate_state(dev, &ctx);
- if (WARN_ON(IS_ERR(state)))
- return;
+ ret = PTR_ERR_OR_ZERO(state);
+ if (ret == -EDEADLK) {
+ drm_modeset_backoff(&ctx);
+ goto retry;
+ } else if (WARN_ON(ret)) {
+ goto fail;
+ }
ret = intel_atomic_check(dev, state);
if (ret) {
@@ -15345,6 +15350,7 @@ retry:
}
drm_atomic_state_free(state);
+fail:
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);
}
--
2.1.4
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