linux-kernel - [RFC v3 04/11] drm/nouveau/kms/nv50-: Unroll error cleanup in nv50_head

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Date:   Fri, 17 Apr 2020 15:40:51 -0400
From:   Lyude Paul <lyude@...hat.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Daniel Vetter <daniel@...ll.ch>, Ben Skeggs <bskeggs@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Ilia Mirkin <imirkin@...m.mit.edu>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Peteris Rudzusiks <peteris.rudzusiks@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        nouveau@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [RFC v3 04/11] drm/nouveau/kms/nv50-: Unroll error cleanup in nv50_head_create()

We'll be rolling back more things in this function, and the way it's
structured is a bit confusing. So, let's clean this up a bit and just
unroll in the event of failure.

Signed-off-by: Lyude Paul <lyude@...hat.com>
---
 drivers/gpu/drm/nouveau/dispnv50/head.c | 33 +++++++++++++++++--------
 1 file changed, 23 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/dispnv50/head.c b/drivers/gpu/drm/nouveau/dispnv50/head.c
index 8f6455697ba7..e29ea40e7c33 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/head.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/head.c
@@ -507,20 +507,28 @@ nv50_head_create(struct drm_device *dev, int index)
 
 	if (disp->disp->object.oclass < GV100_DISP) {
 		ret = nv50_base_new(drm, head->base.index, &base);
+		if (ret)
+			goto fail_free;
+
 		ret = nv50_ovly_new(drm, head->base.index, &ovly);
+		if (ret)
+			goto fail_free;
 	} else {
 		ret = nv50_wndw_new(drm, DRM_PLANE_TYPE_PRIMARY,
 				    head->base.index * 2 + 0, &base);
+		if (ret)
+			goto fail_free;
+
 		ret = nv50_wndw_new(drm, DRM_PLANE_TYPE_OVERLAY,
 				    head->base.index * 2 + 1, &ovly);
-	}
-	if (ret == 0)
-		ret = nv50_curs_new(drm, head->base.index, &curs);
-	if (ret) {
-		kfree(head);
-		return ERR_PTR(ret);
+		if (ret)
+			goto fail_free;
 	}
 
+	ret = nv50_curs_new(drm, head->base.index, &curs);
+	if (ret)
+		goto fail_free;
+
 	crtc = &head->base.base;
 	drm_crtc_init_with_planes(dev, crtc, &base->plane, &curs->plane,
 				  &nv50_head_func, "head-%d", head->base.index);
@@ -533,11 +541,16 @@ nv50_head_create(struct drm_device *dev, int index)
 
 	if (head->func->olut_set) {
 		ret = nv50_lut_init(disp, &drm->client.mmu, &head->olut);
-		if (ret) {
-			nv50_head_destroy(crtc);
-			return ERR_PTR(ret);
-		}
+		if (ret)
+			goto fail_crtc_cleanup;
 	}
 
 	return head;
+
+fail_crtc_cleanup:
+	drm_crtc_cleanup(crtc);
+fail_free:
+	kfree(head);
+
+	return ERR_PTR(ret);
 }
-- 
2.25.1