[PATCH] drm/i915: Handle error paths during watermark sanitization properly (v2)

[Matt Roper <matthew.d.roper@intel.com>]

sanitize_watermarks() does not properly handle errors returned by
drm_atomic_helper_duplicate_state().  Make failures drop locks before
returning.  We also change the lock of connection_mutex to a
drm_modeset_lock_all_ctx() to make sure any EDEADLK's are handled
earlier.

v2: Change call to lock connetion_mutex with a call to
    drm_modeset_lock_all_ctx().  This ensures that any lock contention
    is handled earlier and drm_atomic_helper_duplicate_state() won't
    return EDEADLK.

Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
---
Hopefully a fix for the issue that the CI system tripped over.

 drivers/gpu/drm/i915/intel_display.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 391cc7f..5fc942a 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -15307,7 +15307,7 @@ static void sanitize_watermarks(struct drm_device *dev)
 	 */
 	drm_modeset_acquire_init(&ctx, 0);
 retry:
-	ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
+	ret = drm_modeset_lock_all_ctx(dev, &ctx);
 	if (ret == -EDEADLK) {
 		drm_modeset_backoff(&ctx);
 		goto retry;
@@ -15317,7 +15317,7 @@ retry:
 
 	state = drm_atomic_helper_duplicate_state(dev, &ctx);
 	if (WARN_ON(IS_ERR(state)))
-		return;
+		goto fail;
 
 	ret = intel_atomic_check(dev, state);
 	if (ret) {
@@ -15345,6 +15345,7 @@ retry:
 	}
 
 	drm_atomic_state_free(state);
+fail:
 	drm_modeset_drop_locks(&ctx);
 	drm_modeset_acquire_fini(&ctx);
 }
-- 
2.1.4

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