From 992cbf19b32900efa17850b9fa0031fd623edd4d Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Thu, 6 Aug 2015 15:06:40 +0200
Subject: [PATCH] drm/atomic: Call ww_acquire_done after check phase is
 complete

We want to make sure that no one tries to acquire more locks and
states, and ww mutexes provide debug facilities for that. So use them.

v2: Only call acquire_done when ->atomic_check was successful to avoid
falling over an -EDEADLK (spotted by Maarten).

Cc: Rob Clark <robdclark@gmail.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/drm_atomic.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 434915448ea0..1066e4b658cf 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -1230,6 +1230,9 @@ int drm_atomic_check_only(struct drm_atomic_state *state)
 		}
 	}
 
+	if (ret == 0)
+		ww_acquire_done(&state->acquire_ctx->ww_ctx);
+
 	return ret;
 }
 EXPORT_SYMBOL(drm_atomic_check_only);
-- 
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