[PATCH] drm/virtio: Don't return invalid caps on timeout

[Tomeu Vizoso]

If the wait timeouts, the caps are probably invalid and we shouldn't be
passing them to userspace.

Signed-off-by: Tomeu Vizoso <tomeu.viz...@collabora.com>
---
 drivers/gpu/drm/virtio/virtgpu_ioctl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c 
b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index b94bd5440e57..902120ad4a6d 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -517,6 +517,8 @@ static int virtio_gpu_get_caps_ioctl(struct drm_device *dev,
 
        ret = wait_event_timeout(vgdev->resp_wq,
                                 atomic_read(&cache_ent->is_valid), 5 * HZ);
+       if (!ret)
+               return -EBUSY;
 
        ptr = cache_ent->caps_cache;
 
-- 
2.14.3