[PATCH 3/4] drm/tegra: gr3d: Properly clean up resources

[Thierry Reding]

From: Thierry Reding <treding at nvidia.com>

Failure to register the Tegra DRM client would leak the resources. Move
cleanup code to error unwinding gotos to fix that and share the cleanup
code with the other error paths.

Signed-off-by: Thierry Reding <treding at nvidia.com>
---
 drivers/gpu/drm/tegra/gr3d.c | 27 +++++++++++++++++++++------
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/tegra/gr3d.c b/drivers/gpu/drm/tegra/gr3d.c
index ce5120683091..e129f1afff33 100644
--- a/drivers/gpu/drm/tegra/gr3d.c
+++ b/drivers/gpu/drm/tegra/gr3d.c
@@ -52,8 +52,8 @@ static int gr3d_init(struct host1x_client *client)
 
 	client->syncpts[0] = host1x_syncpt_request(client, flags);
 	if (!client->syncpts[0]) {
-		host1x_channel_put(gr3d->channel);
-		return -ENOMEM;
+		err = -ENOMEM;
+		goto put;
 	}
 
 	if (tegra->domain) {
@@ -65,15 +65,30 @@ static int gr3d_init(struct host1x_client *client)
 				dev_err(client->dev,
 					"failed to attach to domain: %d\n",
 					err);
-				host1x_syncpt_free(client->syncpts[0]);
-				host1x_channel_put(gr3d->channel);
 				iommu_group_put(gr3d->group);
-				return err;
+				goto free;
 			}
 		}
 	}
 
-	return tegra_drm_register_client(dev->dev_private, drm);
+	err = tegra_drm_register_client(dev->dev_private, drm);
+	if (err < 0) {
+		dev_err(client->dev, "failed to register client: %d\n", err);
+		goto detach;
+	}
+
+	return 0;
+
+detach:
+	if (gr3d->group) {
+		iommu_detach_group(tegra->domain, gr3d->group);
+		iommu_group_put(gr3d->group);
+	}
+free:
+	host1x_syncpt_free(client->syncpts[0]);
+put:
+	host1x_channel_put(gr3d->channel);
+	return err;
 }
 
 static int gr3d_exit(struct host1x_client *client)
-- 
2.17.0