From nobody Thu Oct 9 06:06:40 2025 Received: from relay5-d.mail.gandi.net (relay5-d.mail.gandi.net [217.70.183.197]) (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 EBF36284B3B for ; Fri, 20 Jun 2025 09:32:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.197 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750411961; cv=none; b=u+mYSVer2Yy9zr+poPJ21/S5L9I9KleSuLFBss5iDtHgbhmmcsvMNT0IZ+V18wWXCQLXLZl+y4rYQ3SiI5WUXxP19UK7JQXbhHKAJ6nBWtvS9Ag7PX5C2BWeSTbQ5w2Kn61ArUvu1SOe5NjeMsD+RmysZBxhOXy5NWiiwdWmgbk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750411961; c=relaxed/simple; bh=Ep69Pfyd5wvBBReabnPz8npm7HDlyBatWfanik8X46s=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=UoTwANddT//xVzKwwFiyKjs2XiClBjM6EqOjU227ZlyW/VZ2PYW8kroMTc0r2e8olL/ZJt3z9UwlAFic7ugYg+oQQSJLsBTqU2VCVWvScV4ZJrzwN4OfCG7TzGhapgFP4Q++J8O4B6R8ZwFo6V2jsli/IsHdUYDEC21fS6iAdLk= 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=jWmJXNyi; arc=none smtp.client-ip=217.70.183.197 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="jWmJXNyi" Received: by mail.gandi.net (Postfix) with ESMTPSA id D677A4330F; Fri, 20 Jun 2025 09:32:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1750411957; 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=XrSpgORb7l30m7J0bgJ3mrlYbojDB6bJ1lPqGSeyWRU=; b=jWmJXNyiGOXUGcO3HE28SF+lVXoX3ZmdhfmQrgIwGoZb90V+PZY6EjzD8QeiZSmhqBwDUm HVW9Mi1rEq+9RuU+GlkK+kr8aKJxtr7S1QJFGFsnfQHxdeMRvLCuRqb/3jTlG6wCwXMnDE EiyJSeaRoRNpHwNVYhDxucs+9kTBIy5Dp44xlpWWvPHuq/YZfgmYy+Is0durBg1ilrG3er CExbCfTpOo5wJHDJjQ/m0KfBFz8ZpGQt/iYA5roqwg9xx/TaSOz2PjrjbZf8mr3v830T6P MrqBp5a8vattncBjHvttUbnL3cE79olJ68wBB6UfDvAmY83xNSkFHfT496Wh8Q== From: Luca Ceresoli Date: Fri, 20 Jun 2025 11:32:07 +0200 Subject: [PATCH 2/3] drm/bridge: get/put the bridge reference in drm_bridge_attach/detach() 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: <20250620-drm-bridge-alloc-getput-drm-bridge-c-v1-2-bad7eba5d117@bootlin.com> References: <20250620-drm-bridge-alloc-getput-drm-bridge-c-v1-0-bad7eba5d117@bootlin.com> In-Reply-To: <20250620-drm-bridge-alloc-getput-drm-bridge-c-v1-0-bad7eba5d117@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 Cc: Dmitry Baryshkov , Anusha Srivatsa , Thomas Petazzoni , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Luca Ceresoli X-Mailer: b4 0.14.2 X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeeffedrtddvgdektdehucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuifetpfffkfdpucggtfgfnhhsuhgsshgtrhhisggvnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhfffugggtgffkfhgjvfevofesthejredtredtjeenucfhrhhomhepnfhutggrucevvghrvghsohhlihcuoehluhgtrgdrtggvrhgvshholhhisegsohhothhlihhnrdgtohhmqeenucggtffrrghtthgvrhhnpeeiieeuvdfftefgueduleehueetgffgjeeitedtteetkeeuueeuueekveevvdeuveenucfkphepvdgrtddvmeeijedtmedvtddvtdemvggrtddumegsvgegudemleehvgejmeefgeefmeeludefvgenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpedvrgdtvdemieejtdemvddtvddtmegvrgdtudemsggvgedumeelhegvjeemfeegfeemledufegvpdhhvghloheplgduledvrdduieekrddujeekrdejhegnpdhmrghilhhfrhhomheplhhutggrrdgtvghrvghsohhlihessghoohhtlhhinhdrtghomhdpnhgspghrtghpthhtohepudejpdhrtghpthhtoheprghirhhlihgvugesghhmrghilhdrtghomhdprhgtphhtthhopehrfhhoshhssehkvghrnhgvlhdrohhrghdprhgtphhtthhopehthhhomhgrshdrphgvthgriiiiohhnihessghoohhtlhhinhdrtghomhdprhgtphhtthhopehmrggrr hhtvghnrdhlrghnkhhhohhrshhtsehlihhnuhigrdhinhhtvghlrdgtohhmpdhrtghpthhtoheplhhinhhugidqkhgvrhhnvghlsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhrtghpthhtohepmhhrihhprghrugeskhgvrhhnvghlrdhorhhgpdhrtghpthhtohepshhimhhonhgrsehffhiflhhlrdgthhdprhgtphhtthhopegrshhrihhvrghtshesrhgvughhrghtrdgtohhm X-GND-Sasl: luca.ceresoli@bootlin.com drm_bridge_attach() adds the bridge to the encoder chain, so take a reference for that. Vice versa in drm_bridge_detach(). Reviewed-by: Maxime Ripard Signed-off-by: Luca Ceresoli --- Changes in v8: none Changes in v7: - in v6 this was part of "drm/bridge: add support for refcounted DRM bridges", now split to a separate patch --- drivers/gpu/drm/drm_bridge.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c index fa2b2457b16e145e3ace70c53984937096d310d0..f001bbe95559aabf0aac9f25f89= 250ad4e1ad9c8 100644 --- a/drivers/gpu/drm/drm_bridge.c +++ b/drivers/gpu/drm/drm_bridge.c @@ -411,11 +411,17 @@ int drm_bridge_attach(struct drm_encoder *encoder, st= ruct drm_bridge *bridge, if (!encoder || !bridge) return -EINVAL; =20 - if (previous && (!previous->dev || previous->encoder !=3D encoder)) - return -EINVAL; + drm_bridge_get(bridge); =20 - if (bridge->dev) - return -EBUSY; + if (previous && (!previous->dev || previous->encoder !=3D encoder)) { + ret =3D -EINVAL; + goto err_put_bridge; + } + + if (bridge->dev) { + ret =3D -EBUSY; + goto err_put_bridge; + } =20 bridge->dev =3D encoder->dev; bridge->encoder =3D encoder; @@ -464,6 +470,8 @@ int drm_bridge_attach(struct drm_encoder *encoder, stru= ct drm_bridge *bridge, "failed to attach bridge %pOF to encoder %s\n", bridge->of_node, encoder->name); =20 +err_put_bridge: + drm_bridge_put(bridge); return ret; } EXPORT_SYMBOL(drm_bridge_attach); @@ -484,6 +492,7 @@ void drm_bridge_detach(struct drm_bridge *bridge) =20 list_del(&bridge->chain_node); bridge->dev =3D NULL; + drm_bridge_put(bridge); } =20 /** --=20 2.49.0