The current VKMS driver uses managed function to create crtc, but
don't use it to properly clean the crtc workqueue. It is not an
issue yet, but in order to support multiple devices easily,
convert this code to use drm and device managed helpers.

Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
---
 drivers/gpu/drm/vkms/vkms_crtc.c | 14 ++++++++++++++
 drivers/gpu/drm/vkms/vkms_drv.c  |  9 ---------
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
index 40b4d084e3ceef9e1e24b7338efdd9253afee8d6..821b9ac746083630116e05c1cf8e3dc2424ac66a 100644
--- a/drivers/gpu/drm/vkms/vkms_crtc.c
+++ b/drivers/gpu/drm/vkms/vkms_crtc.c
@@ -6,6 +6,7 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_vblank.h>
+#include <drm/drm_managed.h>
 
 #include "vkms_drv.h"
 
@@ -272,6 +273,14 @@ static const struct drm_crtc_helper_funcs vkms_crtc_helper_funcs = {
 	.atomic_disable	= vkms_crtc_atomic_disable,
 };
 
+static void vkms_crtc_destroy_workqueue(struct drm_device *dev,
+					void *raw_vkms_out)
+{
+	struct vkms_output *vkms_out = raw_vkms_out;
+
+	destroy_workqueue(vkms_out->composer_workq);
+}
+
 int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
 		   struct drm_plane *primary, struct drm_plane *cursor)
 {
@@ -297,5 +306,10 @@ int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
 	if (!vkms_out->composer_workq)
 		return -ENOMEM;
 
+	ret = drmm_add_action_or_reset(dev, vkms_crtc_destroy_workqueue,
+				       vkms_out);
+	if (ret)
+		return ret;
+
 	return ret;
 }
diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
index 1226a790bece7e197ab200f9fab68ee3dbaf340f..f6c2acb57f21bde5282682f090f48867ba3615c5 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.c
+++ b/drivers/gpu/drm/vkms/vkms_drv.c
@@ -53,14 +53,6 @@ MODULE_PARM_DESC(enable_overlay, "Enable/Disable overlay support");
 
 DEFINE_DRM_GEM_FOPS(vkms_driver_fops);
 
-static void vkms_release(struct drm_device *dev)
-{
-	struct vkms_device *vkms = drm_device_to_vkms_device(dev);
-
-	if (vkms->output.composer_workq)
-		destroy_workqueue(vkms->output.composer_workq);
-}
-
 static void vkms_atomic_commit_tail(struct drm_atomic_state *old_state)
 {
 	struct drm_device *dev = old_state->dev;
@@ -109,7 +101,6 @@ static const struct drm_debugfs_info vkms_config_debugfs_list[] = {
 
 static const struct drm_driver vkms_driver = {
 	.driver_features	= DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM,
-	.release		= vkms_release,
 	.fops			= &vkms_driver_fops,
 	DRM_GEM_SHMEM_DRIVER_OPS,
 

-- 
2.44.2