drm/msm/mdp4: use drmm-managed allocation for mdp4_crtc

Change struct mdp4_crtc allocation to use drmm_crtc_alloc(). This
removes the need to perform any actions on CRTC destruction.

Signed-off-by: Dmitry Baryshkov <[e-mail]>
Reviewed-by: Abhinav Kumar <[e-mail]>
Patchwork: https://patchwork.freedesktop.org/patch/546184/
Link: https://lore.kernel.org/r/[e-mail]

drivers/gpu/drm/msm/disp/mdp4/mdp4_crtc.c

···
 
 #include <drm/drm_crtc.h>
 #include <drm/drm_flip_work.h>
+#include <drm/drm_managed.h>
 #include <drm/drm_mode.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_vblank.h>
···
 
 	msm_gem_unpin_iova(val, kms->aspace);
 	drm_gem_object_put(val);
-}
-
-static void mdp4_crtc_destroy(struct drm_crtc *crtc)
-{
-	struct mdp4_crtc *mdp4_crtc = to_mdp4_crtc(crtc);
-
-	drm_crtc_cleanup(crtc);
-	drm_flip_work_cleanup(&mdp4_crtc->unref_cursor_work);
-
-	kfree(mdp4_crtc);
 }
 
 /* statically (for now) map planes to mixer stage (z-order): */
···
 
 static const struct drm_crtc_funcs mdp4_crtc_funcs = {
 	.set_config = drm_atomic_helper_set_config,
-	.destroy = mdp4_crtc_destroy,
 	.page_flip = drm_atomic_helper_page_flip,
 	.cursor_set = mdp4_crtc_cursor_set,
 	.cursor_move = mdp4_crtc_cursor_move,
···
 		"DMA_P", "DMA_S", "DMA_E",
 };
 
+static void mdp4_crtc_flip_cleanup(struct drm_device *dev, void *ptr)
+{
+	struct mdp4_crtc *mdp4_crtc = ptr;
+
+	drm_flip_work_cleanup(&mdp4_crtc->unref_cursor_work);
+}
+
 /* initialize crtc */
 struct drm_crtc *mdp4_crtc_init(struct drm_device *dev,
 		struct drm_plane *plane, int id, int ovlp_id,
···
 {
 	struct drm_crtc *crtc = NULL;
 	struct mdp4_crtc *mdp4_crtc;
+	int ret;
 
-	mdp4_crtc = kzalloc(sizeof(*mdp4_crtc), GFP_KERNEL);
-	if (!mdp4_crtc)
-		return ERR_PTR(-ENOMEM);
+	mdp4_crtc = drmm_crtc_alloc_with_planes(dev, struct mdp4_crtc, base,
+						plane, NULL,
+						&mdp4_crtc_funcs, NULL);
+	if (IS_ERR(mdp4_crtc))
+		return ERR_CAST(mdp4_crtc);
 
 	crtc = &mdp4_crtc->base;
 
···
 
 	drm_flip_work_init(&mdp4_crtc->unref_cursor_work,
 			"unref cursor", unref_cursor_worker);
+	ret = drmm_add_action_or_reset(dev, mdp4_crtc_flip_cleanup, mdp4_crtc);
+	if (ret)
+		return ERR_PTR(ret);
 
-	drm_crtc_init_with_planes(dev, crtc, plane, NULL, &mdp4_crtc_funcs,
-				  NULL);
 	drm_crtc_helper_add(crtc, &mdp4_crtc_helper_funcs);
 
 	return crtc;