[PATCH v4 3/3] drm/ingenic: Register devm action to cleanup encoders

[Paul Cercueil]

Since the encoders have been devm-allocated, they will be freed way
before drm_mode_config_cleanup() is called. To avoid use-after-free
conditions, we then must ensure that drm_encoder_cleanup() is called
before the encoders are freed.

v2: Use the new __drmm_simple_encoder_alloc() function

v3: Use the new drmm_plain_simple_encoder_alloc() macro

v4: Use drmm_plain_encoder_alloc() macro

Fixes: c369cb27c267 ("drm/ingenic: Support multiple panels/bridges")
Cc: <sta...@vger.kernel.org> # 5.8+
Signed-off-by: Paul Cercueil <p...@crapouillou.net>
Reviewed-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
---
 drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c 
b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
index d60e1eefc9d1..29742ec5ab95 100644
--- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
@@ -24,6 +24,7 @@
 #include <drm/drm_crtc.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_drv.h>
+#include <drm/drm_encoder.h>
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_fb_cma_helper.h>
 #include <drm/drm_fb_helper.h>
@@ -37,7 +38,6 @@
 #include <drm/drm_plane.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_probe_helper.h>
-#include <drm/drm_simple_kms_helper.h>
 #include <drm/drm_vblank.h>
 
 struct ingenic_dma_hwdesc {
@@ -1024,20 +1024,17 @@ static int ingenic_drm_bind(struct device *dev, bool 
has_components)
                        bridge = devm_drm_panel_bridge_add_typed(dev, panel,
                                                                 
DRM_MODE_CONNECTOR_DPI);
 
-               encoder = devm_kzalloc(dev, sizeof(*encoder), GFP_KERNEL);
-               if (!encoder)
-                       return -ENOMEM;
+               encoder = drmm_plain_encoder_alloc(drm, NULL, 
DRM_MODE_ENCODER_DPI, NULL);
+               if (IS_ERR(encoder)) {
+                       ret = PTR_ERR(encoder);
+                       dev_err(dev, "Failed to init encoder: %d\n", ret);
+                       return ret;
+               }
 
                encoder->possible_crtcs = 1;
 
                drm_encoder_helper_add(encoder, 
&ingenic_drm_encoder_helper_funcs);
 
-               ret = drm_simple_encoder_init(drm, encoder, 
DRM_MODE_ENCODER_DPI);
-               if (ret) {
-                       dev_err(dev, "Failed to init encoder: %d\n", ret);
-                       return ret;
-               }
-
                ret = drm_bridge_attach(encoder, bridge, NULL, 0);
                if (ret) {
                        dev_err(dev, "Unable to attach bridge\n");
-- 
2.30.2