[PATCH v1] drm/virtio: Fix return value for VIRTGPU_CONTEXT_PARAM_DEBUG_NAME

[Dmitry Osipenko]

The strncpy_from_user() returns number of copied bytes and not zero on
success. The non-zero return value of ioctl is treated as error. Return
zero on success instead of the number of copied bytes.

Fixes: 7add80126bce ("drm/uapi: add explicit virtgpu context debug name")
Signed-off-by: Dmitry Osipenko <dmitry.osipe...@collabora.com>
---
 drivers/gpu/drm/virtio/virtgpu_ioctl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c 
b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 1e2042419f95..e4f76f315550 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -665,6 +665,7 @@ static int virtio_gpu_context_init_ioctl(struct drm_device 
*dev,
                                goto out_unlock;
 
                        vfpriv->explicit_debug_name = true;
+                       ret = 0;
                        break;
                default:
                        ret = -EINVAL;
-- 
2.41.0