drm/vkms: provide a parent device to drm_dev_init()

Earlier commit updated the vgem driver to improve the topology, by
passing a platform device as parent to drm_dev_init(). Shortly
afterwords we updated the core function to BUG() in order to catch any
buggy drivers passing NULL as parent.

While I missed the vkms driver (as the patch predates vkms by a few
months), the BUG caught the issue within couple of hours.

Swap the drm_dev_init <> platform_device_register_simple order, to
the driver back to life.

Fixes: f08877e79485 ("drm: BUG_ON if passing NULL parent to drm_dev_init")
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Deepak Sharma <deepak.sharma@amd.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Sean Paul <sean@poorly.run>
Cc: Haneen Mohammed <hamohammed.sa@gmail.com>
Cc: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Reported-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20181026100550.625-1-emil.l.velikov@gmail.com

diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
index 07cfde1..a3d57e0 100644 (file)
--- a/drivers/gpu/drm/vkms/vkms_drv.c
+++ b/drivers/gpu/drm/vkms/vkms_drv.c
@@ -108,17 +108,18 @@ static int __init vkms_init(void)
        if (!vkms_device)
                return -ENOMEM;
 
-       ret = drm_dev_init(&vkms_device->drm, &vkms_driver, NULL);
-       if (ret)
-               goto out_free;
-
        vkms_device->platform =
                platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
        if (IS_ERR(vkms_device->platform)) {
                ret = PTR_ERR(vkms_device->platform);
-               goto out_fini;
+               goto out_free;
        }
 
+       ret = drm_dev_init(&vkms_device->drm, &vkms_driver,
+                          &vkms_device->platform->dev);
+       if (ret)
+               goto out_unregister;
+
        vkms_device->drm.irq_enabled = true;
 
        ret = drm_vblank_init(&vkms_device->drm, 1);
@@ -129,20 +130,20 @@ static int __init vkms_init(void)
 
        ret = vkms_modeset_init(vkms_device);
        if (ret)
-               goto out_unregister;
+               goto out_fini;
 
        ret = drm_dev_register(&vkms_device->drm, 0);
        if (ret)
-               goto out_unregister;
+               goto out_fini;
 
        return 0;
 
-out_unregister:
-       platform_device_unregister(vkms_device->platform);
-
 out_fini:
        drm_dev_fini(&vkms_device->drm);
 
+out_unregister:
+       platform_device_unregister(vkms_device->platform);
+
 out_free:
        kfree(vkms_device);
        return ret;