[PATCH 4/7] drm/fsl-dcu: handle initialization errors properly

[Stefan Agner]

If initialization fails (e.g. due to missing panel node or deferred
probe) make sure to roll-back all operations and return the error
code.

Signed-off-by: Stefan Agner <stefan at agner.ch>
---
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_kms.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_kms.c 
b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_kms.c
index 0ef5959..c564ec6 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_kms.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_kms.c
@@ -25,6 +25,8 @@ static const struct drm_mode_config_funcs 
fsl_dcu_drm_mode_config_funcs = {

 int fsl_dcu_drm_modeset_init(struct fsl_dcu_drm_device *fsl_dev)
 {
+       int ret;
+
        drm_mode_config_init(fsl_dev->drm);

        fsl_dev->drm->mode_config.min_width = 0;
@@ -33,11 +35,25 @@ int fsl_dcu_drm_modeset_init(struct fsl_dcu_drm_device 
*fsl_dev)
        fsl_dev->drm->mode_config.max_height = 2047;
        fsl_dev->drm->mode_config.funcs = &fsl_dcu_drm_mode_config_funcs;

-       drm_kms_helper_poll_init(fsl_dev->drm);
-       fsl_dcu_drm_crtc_create(fsl_dev);
-       fsl_dcu_drm_encoder_create(fsl_dev, &fsl_dev->crtc);
-       fsl_dcu_drm_connector_create(fsl_dev, &fsl_dev->encoder);
+       ret = fsl_dcu_drm_crtc_create(fsl_dev);
+       if (ret)
+               return ret;
+
+       ret = fsl_dcu_drm_encoder_create(fsl_dev, &fsl_dev->crtc);
+       if (ret)
+               goto fail_encoder;
+
+       ret = fsl_dcu_drm_connector_create(fsl_dev, &fsl_dev->encoder);
+       if (ret)
+               goto fail_connector;
+
        drm_mode_config_reset(fsl_dev->drm);
+       drm_kms_helper_poll_init(fsl_dev->drm);

        return 0;
+fail_encoder:
+       fsl_dev->crtc.funcs->destroy(&fsl_dev->crtc);
+fail_connector:
+       fsl_dev->encoder.funcs->destroy(&fsl_dev->encoder);
+       return ret;
 }
-- 
2.6.2