drm/drv: drm_dev_unplug(): Move out drm_dev_put() call

This makes it possible to use drm_dev_unplug() with the upcoming
devm_drm_dev_init() which will do drm_dev_put() in its release callback.

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: David (ChunMing) Zhou <David1.Zhou@amd.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Sean Paul <sean@poorly.run>
Cc: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190208140103.28919-3-noralf@tronnes.org

drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c

@@ -973,6 +973,7 @@ amdgpu_pci_remove(struct pci_dev *pdev)
 
 	DRM_ERROR("Device removal is currently not supported outside of fbcon\n");
 	drm_dev_unplug(dev);
+	drm_dev_put(dev);
 	pci_disable_device(pdev);
 	pci_set_drvdata(pdev, NULL);
 }

drivers/gpu/drm/drm_drv.c

@@ -376,7 +376,6 @@ void drm_dev_unplug(struct drm_device *dev)
 	synchronize_srcu(&drm_unplug_srcu);
 
 	drm_dev_unregister(dev);
-	drm_dev_put(dev);
 }
 EXPORT_SYMBOL(drm_dev_unplug);
 

drivers/gpu/drm/udl/udl_drv.c

@@ -107,6 +107,7 @@ static void udl_usb_disconnect(struct usb_interface *interface)
 	udl_fbdev_unplug(dev);
 	udl_drop_usb(dev);
 	drm_dev_unplug(dev);
+	drm_dev_put(dev);
 }
 
 /*

drivers/gpu/drm/xen/xen_drm_front.c

@@ -582,6 +582,7 @@ static void xen_drm_drv_fini(struct xen_drm_front_info *front_info)
 
 	drm_kms_helper_poll_fini(dev);
 	drm_dev_unplug(dev);
+	drm_dev_put(dev);
 
 	front_info->drm_info = NULL;