linux-kernel - [PATCH] virtio-gpu: fix output lookup

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Message-Id: <1464609806-22013-1-git-send-email-kraxel@redhat.com>
Date:	Mon, 30 May 2016 14:03:26 +0200
From:	Gerd Hoffmann <kraxel@...hat.com>
To:	dri-devel@...hat.com
Cc:	Gerd Hoffmann <kraxel@...hat.com>, David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org (open list:VIRTIO GPU DRIVER),
	virtualization@...ts.linux-foundation.org (open list:VIRTIO GPU DRIVER),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] virtio-gpu: fix output lookup

Needed for multihead setups where we can have disabled
outputs and therefore plane->crtc can be NULL.

Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
---
 drivers/gpu/drm/virtio/virtgpu_plane.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c b/drivers/gpu/drm/virtio/virtgpu_plane.c
index 70b44a2..e50674b 100644
--- a/drivers/gpu/drm/virtio/virtgpu_plane.c
+++ b/drivers/gpu/drm/virtio/virtgpu_plane.c
@@ -63,11 +63,17 @@ static void virtio_gpu_plane_atomic_update(struct drm_plane *plane,
 {
 	struct drm_device *dev = plane->dev;
 	struct virtio_gpu_device *vgdev = dev->dev_private;
-	struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(plane->crtc);
+	struct virtio_gpu_output *output = NULL;
 	struct virtio_gpu_framebuffer *vgfb;
 	struct virtio_gpu_object *bo;
 	uint32_t handle;
 
+	if (plane->state->crtc)
+		output = drm_crtc_to_virtio_gpu_output(plane->state->crtc);
+	if (old_state->crtc)
+		output = drm_crtc_to_virtio_gpu_output(old_state->crtc);
+	WARN_ON(!output);
+
 	if (plane->state->fb) {
 		vgfb = to_virtio_gpu_framebuffer(plane->state->fb);
 		bo = gem_to_virtio_gpu_obj(vgfb->obj);
-- 
1.8.3.1