drm/msm/mdp5: use devres-managed allocation for configuration data

Use devm_kzalloc to create configuration data structure. This allows us
to remove corresponding kfree and drop mdp5_cfg_destroy() function.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/546156/
Link: https://lore.kernel.org/r/20230708010407.3871346-3-dmitry.baryshkov@linaro.org

drivers/gpu/drm/msm/disp/mdp5/mdp5_cfg.c

@@ -1350,23 +1350,17 @@ int mdp5_cfg_get_hw_rev(struct mdp5_cfg_handler *cfg_handler)
 	return cfg_handler->revision;
 }
 
-void mdp5_cfg_destroy(struct mdp5_cfg_handler *cfg_handler)
-{
-	kfree(cfg_handler);
-}
-
 struct mdp5_cfg_handler *mdp5_cfg_init(struct mdp5_kms *mdp5_kms,
 		uint32_t major, uint32_t minor)
 {
 	struct drm_device *dev = mdp5_kms->dev;
 	struct mdp5_cfg_handler *cfg_handler;
 	const struct mdp5_cfg_handler *cfg_handlers;
-	int i, ret = 0, num_handlers;
+	int i, num_handlers;
 
-	cfg_handler = kzalloc(sizeof(*cfg_handler), GFP_KERNEL);
+	cfg_handler = devm_kzalloc(dev->dev, sizeof(*cfg_handler), GFP_KERNEL);
 	if (unlikely(!cfg_handler)) {
-		ret = -ENOMEM;
-		goto fail;
+		return ERR_PTR(-ENOMEM);
 	}
 
 	switch (major) {
@@ -1381,8 +1375,7 @@ struct mdp5_cfg_handler *mdp5_cfg_init(struct mdp5_kms *mdp5_kms,
 	default:
 		DRM_DEV_ERROR(dev->dev, "unexpected MDP major version: v%d.%d\n",
 				major, minor);
-		ret = -ENXIO;
-		goto fail;
+		return ERR_PTR(-ENXIO);
 	}
 
 	/* only after mdp5_cfg global pointer's init can we access the hw */
@@ -1396,8 +1389,7 @@ struct mdp5_cfg_handler *mdp5_cfg_init(struct mdp5_kms *mdp5_kms,
 	if (unlikely(!mdp5_cfg)) {
 		DRM_DEV_ERROR(dev->dev, "unexpected MDP minor revision: v%d.%d\n",
 				major, minor);
-		ret = -ENXIO;
-		goto fail;
+		return ERR_PTR(-ENXIO);
 	}
 
 	cfg_handler->revision = minor;
@@ -1406,10 +1398,4 @@ struct mdp5_cfg_handler *mdp5_cfg_init(struct mdp5_kms *mdp5_kms,
 	DBG("MDP5: %s hw config selected", mdp5_cfg->name);
 
 	return cfg_handler;
-
-fail:
-	if (cfg_handler)
-		mdp5_cfg_destroy(cfg_handler);
-
-	return ERR_PTR(ret);
 }

drivers/gpu/drm/msm/disp/mdp5/mdp5_cfg.h

@@ -121,6 +121,5 @@ int mdp5_cfg_get_hw_rev(struct mdp5_cfg_handler *cfg_hnd);
 
 struct mdp5_cfg_handler *mdp5_cfg_init(struct mdp5_kms *mdp5_kms,
 		uint32_t major, uint32_t minor);
-void mdp5_cfg_destroy(struct mdp5_cfg_handler *cfg_hnd);
 
 #endif /* __MDP5_CFG_H__ */

drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c

@@ -629,8 +629,6 @@ static void mdp5_destroy(struct mdp5_kms *mdp5_kms)
 		mdp5_ctlm_destroy(mdp5_kms->ctlm);
 	if (mdp5_kms->smp)
 		mdp5_smp_destroy(mdp5_kms->smp);
-	if (mdp5_kms->cfg)
-		mdp5_cfg_destroy(mdp5_kms->cfg);
 
 	for (i = 0; i < mdp5_kms->num_intfs; i++)
 		kfree(mdp5_kms->intfs[i]);