From nobody Tue Oct 7 18:25:17 2025 Received: from relay4-d.mail.gandi.net (relay4-d.mail.gandi.net [217.70.183.196]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 443192E1C7E for ; Tue, 8 Jul 2025 15:49:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.196 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751989743; cv=none; b=CGbiyK7f1hklwvMG6yogMzIF2fS6jqLKEWFuCr7C19TKTXuZe+JRU16Y9sJkkqSQS56a1siMS0shY6Pf19byVkdgRzzv0gL3ukVpiEpmzYvyOzIj4AlozXci3bzfZdOJEAsoRT4DYiakc/4ffqL5ZzIBFtKw9Nqp5OPi+NMMTiI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751989743; c=relaxed/simple; bh=Wx9s0r2AthmX11P43fbPz0hTzvYXiQszbTtdHGuEwko=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=sReZMUFOiUmn9YSa9qyM82Yso9nzjur10XizbkHWm8Tj5Jr1WiMnmMpkcoYXEGZUyziYIsgJxrPuqdI++NMM5daU0xR9F30gKIA3RfWqb3FeCqzlF3xK+J21WXlcMbJAP3x2HcKEp0KzjNk847xqyM+/6b2KdYeTRtpdz1zCaAg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=K5lsH0mP; arc=none smtp.client-ip=217.70.183.196 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="K5lsH0mP" Received: by mail.gandi.net (Postfix) with ESMTPSA id 77C83443F7; Tue, 8 Jul 2025 15:48:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1751989739; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8kzKdTFZxjIN/wGrFse6bZOjUwF+0Qz+jgAutxbN/e0=; b=K5lsH0mP9kjMQh9RAe/YoQT7hhK5hnOhow3Fac+mBn/tjGyH1XxoGbyjCXDxznP+ydrM6Z y11v1Ql14zIQNbtjr57bO4GNf249ntpT3uJNe8GqpM1t76FC/YN5YPpjnEGqtow7kHpBVx Opy+gTWh7MY4zEoNh76zwpoYUu88UfYA6TpubUkYEHCKG6gsMQ0icDi7MhW7DfLGs6EHp0 nwhjLr8JMGMnpaZdfJucCV39YqLe3B747ZdgqMsCJ9EGnCO3IXH530Wq15zTSWAE161RUL qJTmeSHybTc6CYafMI8BTAwp97bJZXaGeFjcSFD+RsDa9zR4UKose99kEe+aTw== From: Luca Ceresoli Date: Tue, 08 Jul 2025 17:48:19 +0200 Subject: [PATCH v9 2/5] drm/bridge: get the bridge returned by drm_bridge_chain_get_first_bridge() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250708-drm-bridge-alloc-getput-drm_bridge_chain_get_first_bridge-v9-2-db1ba3df7f58@bootlin.com> References: <20250708-drm-bridge-alloc-getput-drm_bridge_chain_get_first_bridge-v9-0-db1ba3df7f58@bootlin.com> In-Reply-To: <20250708-drm-bridge-alloc-getput-drm_bridge_chain_get_first_bridge-v9-0-db1ba3df7f58@bootlin.com> To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , David Airlie , Simona Vetter , Marek Vasut , Stefan Agner , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam Cc: Liu Ying , Hui Pu , Thomas Petazzoni , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, Luca Ceresoli X-Mailer: b4 0.14.2 X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeeffedrtdefgdefhedtkecutefuodetggdotefrodftvfcurfhrohhfihhlvgemucfitefpfffkpdcuggftfghnshhusghstghrihgsvgenuceurghilhhouhhtmecufedtudenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhephfffufggtgfgkfhfjgfvvefosehtjeertdertdejnecuhfhrohhmpefnuhgtrgcuvegvrhgvshholhhiuceolhhutggrrdgtvghrvghsohhlihessghoohhtlhhinhdrtghomheqnecuggftrfgrthhtvghrnhepieeiuedvffetgfeuudelheeutefggfejieettdetteekueeuueeukeevvedvueevnecukfhppeekjedruddvtddrvddukedrvddtjeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpeekjedruddvtddrvddukedrvddtjedphhgvlhhopegludelvddrudeikedruddrudefngdpmhgrihhlfhhrohhmpehluhgtrgdrtggvrhgvshholhhisegsohhothhlihhnrdgtohhmpdhnsggprhgtphhtthhopedvhedprhgtphhtthhopehmrggrrhhtvghnrdhlrghnkhhhohhrshhtsehlihhnuhigrdhinhhtvghlrdgtohhmpdhrtghpthhtoheprghirhhlihgvugesghhmrghilhdrtghomhdprhgtphhtthhopegurhhiqdguvghvvghlsehlihhsthhsrdhfrhgvvgguvghskhhtohhprdhorhhgpdhrtghpthhtoheplhhutggrrdgtvghrvghsohhlihessghoohhtlhhinhdrtghomhdprhgtphhtt hhopehmrhhiphgrrhgusehkvghrnhgvlhdrohhrghdprhgtphhtthhopehrfhhoshhssehkvghrnhgvlhdrohhrghdprhgtphhtthhopehjvghrnhgvjhdrshhkrhgrsggvtgesghhmrghilhdrtghomhdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrgh X-GND-Sasl: luca.ceresoli@bootlin.com drm_bridge_chain_get_first_bridge() returns a bridge pointer that the caller could hold for a long time. Increment the refcount of the returned bridge and document it must be put by the caller. Reviewed-by: Maxime Ripard Signed-off-by: Luca Ceresoli --- This patch was added in v7. --- include/drm/drm_bridge.h | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h index 88e7a41c39eb1163bd455003e9ca40468932d97a..53508d2e7acf45dea8eab71e2ce= 6dbcdd6739de5 100644 --- a/include/drm/drm_bridge.h +++ b/include/drm/drm_bridge.h @@ -1336,6 +1336,9 @@ drm_bridge_get_prev_bridge(struct drm_bridge *bridge) * drm_bridge_chain_get_first_bridge() - Get the first bridge in the chain * @encoder: encoder object * + * The refcount of the returned bridge is incremented. Use drm_bridge_put() + * when done with it. + * * RETURNS: * the first bridge in the chain, or NULL if @encoder has no bridge attach= ed * to it. @@ -1343,8 +1346,8 @@ drm_bridge_get_prev_bridge(struct drm_bridge *bridge) static inline struct drm_bridge * drm_bridge_chain_get_first_bridge(struct drm_encoder *encoder) { - return list_first_entry_or_null(&encoder->bridge_chain, - struct drm_bridge, chain_node); + return drm_bridge_get(list_first_entry_or_null(&encoder->bridge_chain, + struct drm_bridge, chain_node)); } =20 /** --=20 2.50.0