linux-kernel - [PATCH v6 6/8] drm: writeback: Add missing cleanup in case of initialization failure

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Message-Id: <20241230-google-vkms-managed-v6-6-15c7d65cd63b@bootlin.com>
Date: Mon, 30 Dec 2024 19:37:36 +0100
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>, 
 Melissa Wen <melissa.srw@...il.com>, 
 Maíra Canal <mairacanal@...eup.net>, 
 Haneen Mohammed <hamohammed.sa@...il.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Simona Vetter <simona.vetter@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, arthurgrillo@...eup.net, 
 linux-kernel@...r.kernel.org, jeremie.dautheribes@...tlin.com, 
 miquel.raynal@...tlin.com, thomas.petazzoni@...tlin.com, 
 seanpaul@...gle.com, nicolejadeyee@...gle.com, 
 Louis Chauvet <louis.chauvet@...tlin.com>
Subject: [PATCH v6 6/8] drm: writeback: Add missing cleanup in case of
 initialization failure

The current implementation of drm_writeback_connector initialization does
not properly clean up all resources in case of failure (allocated
properties and possible_encoders). Add this cleaning in case of failure.

Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
---
 drivers/gpu/drm/drm_writeback.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_writeback.c b/drivers/gpu/drm/drm_writeback.c
index 494400b09796d37ed89145da45d5f1e029632de5..9c69f7181e02c23dabce488405608c40d4184af5 100644
--- a/drivers/gpu/drm/drm_writeback.c
+++ b/drivers/gpu/drm/drm_writeback.c
@@ -247,18 +247,20 @@ static int __drm_writeback_connector_init(struct drm_device *dev,
 	int ret = create_writeback_properties(dev);
 
 	if (ret != 0)
-		return ret;
+		goto failed_properties;
 
 	connector->interlace_allowed = 0;
 
 	ret = drm_connector_attach_encoder(connector, enc);
 	if (ret)
-		return ret;
+		goto failed_properties;
 
 	blob = drm_property_create_blob(dev, n_formats * sizeof(*formats),
 					formats);
-	if (IS_ERR(blob))
-		return PTR_ERR(blob);
+	if (IS_ERR(blob)) {
+		ret = PTR_ERR(blob);
+		goto failed_blob;
+	}
 
 	INIT_LIST_HEAD(&wb_connector->job_queue);
 	spin_lock_init(&wb_connector->job_lock);
@@ -281,6 +283,11 @@ static int __drm_writeback_connector_init(struct drm_device *dev,
 	wb_connector->pixel_formats_blob_ptr = blob;
 
 	return 0;
+failed_blob:
+	connector->possible_encoders &= ~drm_encoder_mask(enc);
+failed_properties:
+	delete_writeback_properties(dev);
+	return ret;
 }
 
 /**

-- 
2.47.1