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Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tuCC8-000000036gR-1BOA; Mon, 17 Mar 2025 15:16:00 +0000 Received: from relay1-d.mail.gandi.net ([2001:4b98:dc4:8::221]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tuBuM-000000033Op-35F0 for linux-arm-kernel@lists.infradead.org; Mon, 17 Mar 2025 14:57:40 +0000 Received: by mail.gandi.net (Postfix) with ESMTPSA id 7619344392; Mon, 17 Mar 2025 14:57:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1742223455; 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=Qkuh0DXp7wkpHA4U/hr9xccHxf9FKIYItr2z+4BB6U4=; b=X29XjBsFlNR58JFDPaXDWBtoy2+6wpXwLjV2W3cfhdB4282VWXOG529KYxBPs5pWRmlIIW u/TrZ78MytSw6ORQc1VrhWz/rwOCPypN7pYhSWRQXfLcBmgdwSiaQTe82xL1ENk6vJqJR7 xS8abVRKrgePsPb37BG29GSWoGqMwFUvCaPKoQ8OaCTAyC3aXqgElZNlyKvCr96YaLBpdN xf/4Rl0IBl37YG6Y1bYieiEolFgJPieiJx8Hn9rEA7m3d2XezvYu1AzLmfBJagrJUDinJ3 uRIQQhiNfFAEZV4sKFhKazELb0EAvzIrVrlu1pJaKi30UdKV84cTb1+gwQxzBg== Date: Mon, 17 Mar 2025 15:57:30 +0100 From: Luca Ceresoli To: Maxime Ripard Cc: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Thomas Zimmermann , David Airlie , Simona Vetter , Marek Vasut , Stefan Agner , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Inki Dae , Jagan Teki , Marek Szyprowski , Thomas Petazzoni , Anusha Srivatsa , Paul Kocialkowski , Dmitry Baryshkov , =?UTF-8?B?SGVydsOp?= Codina , Hui Pu , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v7 06/11] drm/bridge: get the bridge returned by drm_bridge_chain_get_first_bridge() Message-ID: <20250317155730.4a328641@booty> In-Reply-To: <20250314-aspiring-myrtle-husky-a5f4ac@houat> References: <20250314-drm-bridge-refcount-v7-0-152571f8c694@bootlin.com> <20250314-drm-bridge-refcount-v7-6-152571f8c694@bootlin.com> <20250314-aspiring-myrtle-husky-a5f4ac@houat> Organization: Bootlin X-Mailer: Claws Mail 4.3.1 (GTK 3.24.43; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgddufeelkeduucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuifetpfffkfdpucggtfgfnhhsuhgsshgtrhhisggvnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpeffhffvvefukfgjfhhoofggtgfgsehtjeertdertddvnecuhfhrohhmpefnuhgtrgcuvegvrhgvshholhhiuceolhhutggrrdgtvghrvghsohhlihessghoohhtlhhinhdrtghomheqnecuggftrfgrthhtvghrnhepgeelffefgfehhfdtvdefueefieevkefggfelkeeiudetkeektedvhedukefgvddvnecuffhomhgrihhnpegsohhothhlihhnrdgtohhmnecukfhppedvrgdtvdemieejtdemvddtvddtmegvrgdtudemsggvgedumeelhegvjeemfeegfeemledufegvnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepvdgrtddvmeeijedtmedvtddvtdemvggrtddumegsvgegudemleehvgejmeefgeefmeeludefvgdphhgvlhhopegsohhothihpdhmrghilhhfrhhomheplhhutggrrdgtvghrvghsohhlihessghoohhtlhhinhdrtghomhdpnhgspghrtghpthhtohepfedtpdhrtghpthhtohepmhhrihhprghrugeskhgvrhhnvghlrdhorhhgpdhrtghpthhtoheprghnughriigvjhdrhhgrjhgurgesihhnthgvlhdrtghomhdprhgtphhtthhopehnvghilhdrrghrmhhsthhrohhngheslhhinhgrr hhordhorhhgpdhrtghpthhtoheprhhfohhssheskhgvrhhnvghlrdhorhhgpdhrtghpthhtohepnfgruhhrvghnthdrphhinhgthhgrrhhtsehiuggvrghsohhnsghorghrugdrtghomhdprhgtphhtthhopehjohhnrghssehkfihisghoohdrshgvpdhrtghpthhtohepjhgvrhhnvghjrdhskhhrrggsvggtsehgmhgrihhlrdgtohhmpdhrtghpthhtohepmhgrrghrthgvnhdrlhgrnhhkhhhorhhstheslhhinhhugidrihhnthgvlhdrtghomh X-GND-Sasl: luca.ceresoli@bootlin.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250317_075738_923947_F838A25A X-CRM114-Status: GOOD ( 14.56 ) 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 On Fri, 14 Mar 2025 19:10:41 +0100 Maxime Ripard wrote: > On Fri, Mar 14, 2025 at 11:31:19AM +0100, Luca Ceresoli wrote: > > 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. > > > > Signed-off-by: Luca Ceresoli ... > > @@ -1112,8 +1115,8 @@ 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)); > > } > > We'll need to modify drm_bridge_get_next_bridge, drm_bridge_get_prev_bridge, and > drm_for_each_bridge_in_chain in a similar manner, but for this one Sure. I'm discussing this in the cover letter. Luca -- Luca Ceresoli, Bootlin Embedded Linux and Kernel engineering https://bootlin.com