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

Use devm_kzalloc to create CTL manager data structure. This allows us
to remove corresponding kfree and drop mdp5_ctlm_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/546159/
Link: https://lore.kernel.org/r/20230708010407.3871346-4-dmitry.baryshkov@linaro.org

drivers/gpu/drm/msm/disp/mdp5/mdp5_ctl.c

@@ -681,11 +681,6 @@ void mdp5_ctlm_hw_reset(struct mdp5_ctl_manager *ctl_mgr)
 	}
 }
 
-void mdp5_ctlm_destroy(struct mdp5_ctl_manager *ctl_mgr)
-{
-	kfree(ctl_mgr);
-}
-
 struct mdp5_ctl_manager *mdp5_ctlm_init(struct drm_device *dev,
 		void __iomem *mmio_base, struct mdp5_cfg_handler *cfg_hnd)
 {
@@ -697,18 +692,16 @@ struct mdp5_ctl_manager *mdp5_ctlm_init(struct drm_device *dev,
 	unsigned long flags;
 	int c, ret;
 
-	ctl_mgr = kzalloc(sizeof(*ctl_mgr), GFP_KERNEL);
+	ctl_mgr = devm_kzalloc(dev->dev, sizeof(*ctl_mgr), GFP_KERNEL);
 	if (!ctl_mgr) {
 		DRM_DEV_ERROR(dev->dev, "failed to allocate CTL manager\n");
-		ret = -ENOMEM;
-		goto fail;
+		return ERR_PTR(-ENOMEM);
 	}
 
 	if (WARN_ON(ctl_cfg->count > MAX_CTL)) {
 		DRM_DEV_ERROR(dev->dev, "Increase static pool size to at least %d\n",
 				ctl_cfg->count);
-		ret = -ENOSPC;
-		goto fail;
+		return ERR_PTR(-ENOSPC);
 	}
 
 	/* initialize the CTL manager: */
@@ -727,7 +720,7 @@ struct mdp5_ctl_manager *mdp5_ctlm_init(struct drm_device *dev,
 			DRM_DEV_ERROR(dev->dev, "CTL_%d: base is null!\n", c);
 			ret = -EINVAL;
 			spin_unlock_irqrestore(&ctl_mgr->pool_lock, flags);
-			goto fail;
+			return ERR_PTR(ret);
 		}
 		ctl->ctlm = ctl_mgr;
 		ctl->id = c;
@@ -755,10 +748,4 @@ struct mdp5_ctl_manager *mdp5_ctlm_init(struct drm_device *dev,
 	DBG("Pool of %d CTLs created.", ctl_mgr->nctl);
 
 	return ctl_mgr;
-
-fail:
-	if (ctl_mgr)
-		mdp5_ctlm_destroy(ctl_mgr);
-
-	return ERR_PTR(ret);
 }

drivers/gpu/drm/msm/disp/mdp5/mdp5_ctl.h

@@ -17,7 +17,6 @@ struct mdp5_ctl_manager;
 struct mdp5_ctl_manager *mdp5_ctlm_init(struct drm_device *dev,
 		void __iomem *mmio_base, struct mdp5_cfg_handler *cfg_hnd);
 void mdp5_ctlm_hw_reset(struct mdp5_ctl_manager *ctlm);
-void mdp5_ctlm_destroy(struct mdp5_ctl_manager *ctlm);
 
 /*
  * CTL prototypes:

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

@@ -625,8 +625,6 @@ static void mdp5_destroy(struct mdp5_kms *mdp5_kms)
 {
 	int i;
 
-	if (mdp5_kms->ctlm)
-		mdp5_ctlm_destroy(mdp5_kms->ctlm);
 	if (mdp5_kms->smp)
 		mdp5_smp_destroy(mdp5_kms->smp);