drm/v3d: Use devm_drm_dev_alloc

Also allows us to simplify the unroll code since the drm_dev_put
disappears.
Acked-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20200415074034.175360-9-daniel.vetter@ffwll.ch

drivers/gpu/drm/v3d/v3d_drv.c

@@ -251,29 +251,23 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
 	u32 ident1;
 
 
-	v3d = kzalloc(sizeof(*v3d), GFP_KERNEL);
-	if (!v3d)
-		return -ENOMEM;
+	v3d = devm_drm_dev_alloc(dev, &v3d_drm_driver, struct v3d_dev, drm);
+	if (IS_ERR(v3d))
+		return PTR_ERR(v3d);
+
 	v3d->dev = dev;
 	v3d->pdev = pdev;
 	drm = &v3d->drm;
 
-	ret = drm_dev_init(&v3d->drm, &v3d_drm_driver, dev);
-	if (ret) {
-		kfree(v3d);
-		return ret;
-	}
-
 	platform_set_drvdata(pdev, drm);
-	drmm_add_final_kfree(drm, v3d);
 
 	ret = map_regs(v3d, &v3d->hub_regs, "hub");
 	if (ret)
-		goto dev_destroy;
+		return ret;
 
 	ret = map_regs(v3d, &v3d->core_regs[0], "core0");
 	if (ret)
-		goto dev_destroy;
+		return ret;
 
 	mmu_debug = V3D_READ(V3D_MMU_DEBUG_INFO);
 	dev->coherent_dma_mask =
@@ -291,29 +285,28 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
 		ret = PTR_ERR(v3d->reset);
 
 		if (ret == -EPROBE_DEFER)
-			goto dev_destroy;
+			return ret;
 
 		v3d->reset = NULL;
 		ret = map_regs(v3d, &v3d->bridge_regs, "bridge");
 		if (ret) {
 			dev_err(dev,
 				"Failed to get reset control or bridge regs\n");
-			goto dev_destroy;
+			return ret;
 		}
 	}
 
 	if (v3d->ver < 41) {
 		ret = map_regs(v3d, &v3d->gca_regs, "gca");
 		if (ret)
-			goto dev_destroy;
+			return ret;
 	}
 
 	v3d->mmu_scratch = dma_alloc_wc(dev, 4096, &v3d->mmu_scratch_paddr,
 					GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO);
 	if (!v3d->mmu_scratch) {
 		dev_err(dev, "Failed to allocate MMU scratch page\n");
-		ret = -ENOMEM;
-		goto dev_destroy;
+		return -ENOMEM;
 	}
 
 	pm_runtime_use_autosuspend(dev);
@@ -340,8 +333,6 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
 	v3d_gem_destroy(drm);
 dma_free:
 	dma_free_wc(dev, 4096, v3d->mmu_scratch, v3d->mmu_scratch_paddr);
-dev_destroy:
-	drm_dev_put(drm);
 	return ret;
 }
 
@@ -354,8 +345,6 @@ static int v3d_platform_drm_remove(struct platform_device *pdev)
 
 	v3d_gem_destroy(drm);
 
-	drm_dev_put(drm);
-
 	dma_free_wc(v3d->dev, 4096, v3d->mmu_scratch, v3d->mmu_scratch_paddr);
 
 	return 0;