linux-kernel - [PATCH 4.4 075/192] [PATCH 078/135] drm/atomic: Do not unset crtc when an encoder is stolen

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Message-Id: <20160912152202.083402468@linuxfoundation.org>
Date:   Mon, 12 Sep 2016 18:59:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.4 075/192] [PATCH 078/135] drm/atomic: Do not unset crtc when an encoder is stolen

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 97a8df90875f72ba3b4c3320759fd93cea743261 ]

While we steal the encoder away from the connector the connector may
be updated to use a different encoder.

Without this change if 2 connectors swap encoders one of them will
end up without a crtc.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Reviewed-by: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1452160762-30487-5-git-send-email-maarten.lankhorst@linux.intel.com
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/drm_atomic_helper.c |    4 ----
 1 file changed, 4 deletions(-)

--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -108,7 +108,6 @@ steal_encoder(struct drm_atomic_state *s
 	struct drm_crtc_state *crtc_state;
 	struct drm_connector *connector;
 	struct drm_connector_state *connector_state;
-	int ret;
 
 	/*
 	 * We can only steal an encoder coming from a connector, which means we
@@ -139,9 +138,6 @@ steal_encoder(struct drm_atomic_state *s
 		if (IS_ERR(connector_state))
 			return PTR_ERR(connector_state);
 
-		ret = drm_atomic_set_crtc_for_connector(connector_state, NULL);
-		if (ret)
-			return ret;
 		connector_state->best_encoder = NULL;
 	}