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

Use devm_kzalloc to create SMP data structure. This allows us
to remove corresponding kfree and drop mdp5_smp_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/546172/
Link: https://lore.kernel.org/r/20230708010407.3871346-7-dmitry.baryshkov@linaro.org

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

@@ -618,9 +618,6 @@ static void mdp5_destroy(struct mdp5_kms *mdp5_kms)
 {
 	int i;
 
-	if (mdp5_kms->smp)
-		mdp5_smp_destroy(mdp5_kms->smp);
-
 	for (i = 0; i < mdp5_kms->num_intfs; i++)
 		kfree(mdp5_kms->intfs[i]);
 

drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c

@@ -370,23 +370,17 @@ void mdp5_smp_dump(struct mdp5_smp *smp, struct drm_printer *p)
 		drm_modeset_unlock(&mdp5_kms->glob_state_lock);
 }
 
-void mdp5_smp_destroy(struct mdp5_smp *smp)
-{
-	kfree(smp);
-}
 
 struct mdp5_smp *mdp5_smp_init(struct mdp5_kms *mdp5_kms, const struct mdp5_smp_block *cfg)
 {
+	struct drm_device *dev = mdp5_kms->dev;
 	struct mdp5_smp_state *state;
 	struct mdp5_global_state *global_state;
 	struct mdp5_smp *smp;
-	int ret;
 
-	smp = kzalloc(sizeof(*smp), GFP_KERNEL);
-	if (unlikely(!smp)) {
-		ret = -ENOMEM;
-		goto fail;
-	}
+	smp = devm_kzalloc(dev->dev, sizeof(*smp), GFP_KERNEL);
+	if (unlikely(!smp))
+		return ERR_PTR(-ENOMEM);
 
 	smp->dev = mdp5_kms->dev;
 	smp->blk_cnt = cfg->mmb_count;
@@ -400,9 +394,4 @@ struct mdp5_smp *mdp5_smp_init(struct mdp5_kms *mdp5_kms, const struct mdp5_smp_
 	memcpy(smp->reserved, cfg->reserved, sizeof(smp->reserved));
 
 	return smp;
-fail:
-	if (smp)
-		mdp5_smp_destroy(smp);
-
-	return ERR_PTR(ret);
 }

drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.h

@@ -68,7 +68,6 @@ struct mdp5_smp;
 
 struct mdp5_smp *mdp5_smp_init(struct mdp5_kms *mdp5_kms,
 		const struct mdp5_smp_block *cfg);
-void  mdp5_smp_destroy(struct mdp5_smp *smp);
 
 void mdp5_smp_dump(struct mdp5_smp *smp, struct drm_printer *p);