From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E6289C83F12 for ; Wed, 9 Jul 2025 19:15:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=D4+1FqD98SPvBw7irZRwMNhCOgATWsxx4mj2vRRjvXQ=; b=gLBywQkhHrcA9k7hHaZm+BR38h 9CQNF/8QDANzn7HZ4wWM21KcP2uIMneli1XANbgas5HbvIuq1imGSaFGCapcQvd5NvJFKUtP18Nqd jx+XhhGmuxZ8IG7tOMDyiRkrRpCMA8Mz0VHfAgjTPm1wcGvqe5jbZPlw+WPFNNVuXmMH65zJBRMV9 L9wqaurJoZUzuDY+QwZNoNiv1o99o9Fkrd6dfTA9xpecmYTRVMPOBj4x6XIrGe57+qThhwpFKGNEh 7IUOrCSKoB2wVNylynGjTeTMq72mVdHh4xCLB9p5UA1oSntxXvrdMPZWyHilkXoNExYbRGu9NA+Ww 2tPf8fJA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uZaFr-00000009gMs-3fbS; Wed, 09 Jul 2025 19:14:56 +0000 Received: from relay8-d.mail.gandi.net ([217.70.183.201]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uZXyc-00000009Lwx-3QPn for linux-arm-kernel@lists.infradead.org; Wed, 09 Jul 2025 16:49:00 +0000 Received: by mail.gandi.net (Postfix) with ESMTPSA id 8527743B29; Wed, 9 Jul 2025 16:48:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1752079737; 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=D4+1FqD98SPvBw7irZRwMNhCOgATWsxx4mj2vRRjvXQ=; b=f3gmHcQpY3jlclpQ10Mf16s6qxwzQS4w6CcTcHrofTisuHDx1BbOIxf9uaVkfAPFMh+wbe KR11GJME2pQ2+1mP7+v+zjtjJOlJNdb2Uq/pICu9c4hmA5RbwC6dCJccyM4OrP6bD8DK8k gHhxMN9JTI9Rla6oNNgYseFjZj8HCURnZ1yIyJKFPgLdxBtqaJtbyQTqIIzVO8co6xfdH0 CIitXXE6QrFtCs+uu7R5KPdOt4TK9/45LWjLZzk3X/N5uWL+6sxDtQf2JB7eHfBJZTM1K1 miBFC63oPYMwz1RL1SbCQc4aRkX9rT+RMNPmGgo3yoI3S8zrOUy8Pin2x/IiWw== From: Luca Ceresoli Date: Wed, 09 Jul 2025 18:48:06 +0200 Subject: [PATCH 7/9] drm/bridge: get the bridge returned by drm_bridge_get_next_bridge() MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250709-drm-bridge-alloc-getput-drm_bridge_get_next_bridge-v1-7-48920b9cf369@bootlin.com> References: <20250709-drm-bridge-alloc-getput-drm_bridge_get_next_bridge-v1-0-48920b9cf369@bootlin.com> In-Reply-To: <20250709-drm-bridge-alloc-getput-drm_bridge_get_next_bridge-v1-0-48920b9cf369@bootlin.com> To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Liu Ying , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Tomi Valkeinen , Philipp Zabel Cc: Hui Pu , Thomas Petazzoni , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.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: gggruggvucftvghtrhhoucdtuddrgeeffedrtdefgdefkedtkecutefuodetggdotefrodftvfcurfhrohhfihhlvgemucfitefpfffkpdcuggftfghnshhusghstghrihgsvgenuceurghilhhouhhtmecufedtudenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhephfffufggtgfgkfhfjgfvvefosehtjeertdertdejnecuhfhrohhmpefnuhgtrgcuvegvrhgvshholhhiuceolhhutggrrdgtvghrvghsohhlihessghoohhtlhhinhdrtghomheqnecuggftrfgrthhtvghrnhepieeiuedvffetgfeuudelheeutefggfejieettdetteekueeuueeukeevvedvueevnecukfhppeekjedruddvtddrvddukedrvddtjeenucevlhhushhtvghrufhiiigvpeegnecurfgrrhgrmhepihhnvghtpeekjedruddvtddrvddukedrvddtjedphhgvlhhopegludelvddrudeikedruddrudefngdpmhgrihhlfhhrohhmpehluhgtrgdrtggvrhgvshholhhisegsohhothhlihhnrdgtohhmpdhnsggprhgtphhtthhopedvhedprhgtphhtthhopehtiihimhhmvghrmhgrnhhnsehsuhhsvgdruggvpdhrtghpthhtohepihhmgieslhhishhtshdrlhhinhhugidruggvvhdprhgtphhtthhopefjuhhirdfruhesghgvhhgvrghlthhhtggrrhgvrdgtohhmpdhrtghpthhtohepthhomhhirdhvrghlkhgvihhnvghnsehiuggvrghsohhnsghorghrugdrtghomhdprhgtphhtthhopehvihgtthhorhdrlhhiuhesn higphdrtghomhdprhgtphhtthhopehshhgrfihnghhuoheskhgvrhhnvghlrdhorhhgpdhrtghpthhtohepthhhohhmrghsrdhpvghtrgiiiihonhhisegsohhothhlihhnrdgtohhmpdhrtghpthhtohepphdriigrsggvlhesphgvnhhguhhtrhhonhhigidruggv X-GND-Sasl: luca.ceresoli@bootlin.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250709_094858_987446_52832D50 X-CRM114-Status: GOOD ( 11.19 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org drm_bridge_get_next_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. Signed-off-by: Luca Ceresoli --- include/drm/drm_bridge.h | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h index c2a7a7d2dfc420e9dcf7ea4c093ce1f1b939c820..158d22892bf3ddb469d510735818f14a1c23d7a1 100644 --- a/include/drm/drm_bridge.h +++ b/include/drm/drm_bridge.h @@ -1305,6 +1305,13 @@ drm_bridge_get_current_state(struct drm_bridge *bridge) * drm_bridge_get_next_bridge() - Get the next bridge in the chain * @bridge: bridge object * + * The caller is responsible of having a reference to @bridge via + * drm_bridge_get() or equivalent. This function leaves the refcount of + * @bridge unmodified. + * + * The refcount of the returned bridge is incremented. Use drm_bridge_put() + * when done with it. + * * RETURNS: * the next bridge in the chain after @bridge, or NULL if @bridge is the last. */ @@ -1314,7 +1321,7 @@ drm_bridge_get_next_bridge(struct drm_bridge *bridge) if (list_is_last(&bridge->chain_node, &bridge->encoder->bridge_chain)) return NULL; - return list_next_entry(bridge, chain_node); + return drm_bridge_get(list_next_entry(bridge, chain_node)); } /** -- 2.50.0