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 ACB2FCA5FD2 for ; Thu, 1 Oct 2026 12:43:33 +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=ND0w8x6SjvxTQcT5Pm7Wq/sYjQ6rNdvUYUeltXYrX2I=; b=V8fdUGM9xLR0nh9E+nAZJbo+e2 Y8jqPMb/m+rqckMUrqk70UcG61AiQm3NQkl6kWk6Z2lBXojuotlH1b+YuvQmsvevCIu3v/5PmFrau 3KGA4X3w13/SI4TJjeqIPan5RFxDLoVUnMzLDQ+SZeNu7nM+d1+3c5zN72nzZtIN0wQKW/3ESMLoX 9K9xuMIPLQMAFBT1whkOE9cQ2M4JVu66Qn+OqY6tbZ9cWVqPBMyj21p65JawiX5T/MmUaGtX29Ou1 RPGCtzJkJpezteQlTo+17aL0Ec7NoEEnL0ArBQg5SDN6RnYxtcl0ueT4Fz22YtBcByNRMDyUgIC67 rrcKm6Ng==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xCG8E-000000096QC-2uXS; Thu, 01 Oct 2026 12:43:26 +0000 Received: from smtpout-02.galae.net ([185.246.84.56]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xCG8C-000000096NZ-1Wqk for linux-arm-kernel@lists.infradead.org; Thu, 01 Oct 2026 12:43:26 +0000 Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-02.galae.net (Postfix) with ESMTPS id DA56D1A24E0; Thu, 1 Oct 2026 12:43:22 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id AC37160341; Thu, 1 Oct 2026 12:43:22 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id D73901032809F; Thu, 1 Oct 2026 14:43:15 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1790858600; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=ND0w8x6SjvxTQcT5Pm7Wq/sYjQ6rNdvUYUeltXYrX2I=; b=hjBDSF0xjz9+SLnKqtULk9L55F1t8IHF76eLE6yPLuVb+1l5WFbPCkfQjyi0qfF4PN4t8T KgRDk4m8eGkbk4dsTxhAcR0hZkKofIvhOfBv+MUafnzpCefoSZIBcFOFIhmCQtEV76Hen+ UxAcEvq15ExeMRrovYIVArVwjUTFWSX+w2JdDtbqEbql6L4mhyU/y2bZ5wK28NeRM2PxTe oHq0Oq+41eK9MBbFHOOiQUPxitam1w3sOzAUdRxW4qeVahONucK4sa/TrhbQaepQaA7q+9 14MV+SgjQLxz8KGH1BQ84dIpyoE9ceFiPWg7NDpoPzk7xaleqTuK3VvsDJ26Pw== From: Luca Ceresoli Date: Thu, 01 Oct 2026 14:42:28 +0200 Subject: [PATCH RFC v2 06/24] drm/display: bridge-connector: add APIs to add/remove the connector dynamically MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261001-drm-bridge-hotplug-v2-6-8e34986dcb68@bootlin.com> References: <20261001-drm-bridge-hotplug-v2-0-8e34986dcb68@bootlin.com> In-Reply-To: <20261001-drm-bridge-hotplug-v2-0-8e34986dcb68@bootlin.com> To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Inki Dae , Jagan Teki , Marek Szyprowski , Jessica Zhang , Douglas Anderson , Marek Vasut , Stefan Agner , Frank Li , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam Cc: Hui Pu , Ian Ray , Luca Ceresoli , Thomas Petazzoni , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org X-Mailer: b4 0.16.0 X-Last-TLS-Session-Version: TLSv1.3 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261001_054324_560838_6E1BB58B X-CRM114-Status: GOOD ( 16.06 ) 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_connector_init() adds a drmm-allocated connector. For bridge hotplug drmm allocations are not suitable because a connector may have to be added and removed multiple times in the lifetime of a card. In preparation for bridge hotplug, add APIs to add and remove a connector using regular non-managed allocations. For the dynamic connector, this requires the kfree() the allocated struct drm_bridge_connector in the destroy func. However that func will be called even when using the pre-existing drmm API, leading to a double free (kfree() in the destroy callback + drmm). One option to avoid this issue is introducing two mostly identical drm_connector_funcs instances, one with .destroy and one without. But that would be an annoying code duplication. Instead take a different approach: always allocate using non-drmm kzalloc_obj(), so that deallocation always happen in destroy->kfree(). Signed-off-by: Luca Ceresoli --- Uhm, maybe the change from drmm_kzalloc to kzalloc_obj and addition of kfree to the destroy callback should eb a separate commit? --- drivers/gpu/drm/display/drm_bridge_connector.c | 24 +++++++++++++++++++++++- include/drm/drm_bridge_connector.h | 4 ++++ 2 files changed, 27 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/display/drm_bridge_connector.c b/drivers/gpu/drm/display/drm_bridge_connector.c index 1c222e27767d..2a0065208fb8 100644 --- a/drivers/gpu/drm/display/drm_bridge_connector.c +++ b/drivers/gpu/drm/display/drm_bridge_connector.c @@ -285,6 +285,7 @@ static void drm_bridge_connector_dynconn_destroy(struct drm_connector *connector drm_connector_cleanup(connector); drm_bridge_connector_put_bridges(bridge_connector); + kfree(bridge_connector); } static const struct drm_connector_funcs drm_bridge_connector_funcs = { @@ -1184,7 +1185,7 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm, struct drm_connector *connector; int ret; - bridge_connector = drmm_kzalloc(drm, sizeof(*bridge_connector), GFP_KERNEL); + bridge_connector = kzalloc_obj(*bridge_connector); if (!bridge_connector) return ERR_PTR(-ENOMEM); @@ -1199,3 +1200,24 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm, return connector; } EXPORT_SYMBOL_GPL(drm_bridge_connector_init); + +struct drm_connector *drm_bridge_connector_dynamic_add(struct drm_device *drm, + struct drm_encoder *encoder) +{ + struct drm_bridge_connector *bridge_connector; + + bridge_connector = kzalloc_obj(*bridge_connector); + if (!bridge_connector) + return ERR_PTR(-ENOMEM); + + return drm_bridge_connector_initialize(bridge_connector, drm, encoder); +} +EXPORT_SYMBOL_GPL(drm_bridge_connector_dynamic_add); + +void drm_bridge_connector_dynamic_remove(struct drm_connector *connector) +{ + struct drm_bridge_connector *bridge_connector = to_drm_bridge_connector(connector); + + drm_bridge_connector_fini(bridge_connector); +} +EXPORT_SYMBOL_GPL(drm_bridge_connector_dynamic_remove); diff --git a/include/drm/drm_bridge_connector.h b/include/drm/drm_bridge_connector.h index 69630815fb09..de6ec91dbfab 100644 --- a/include/drm/drm_bridge_connector.h +++ b/include/drm/drm_bridge_connector.h @@ -9,8 +9,12 @@ struct drm_connector; struct drm_device; struct drm_encoder; +struct drm_bridge_connector; struct drm_connector *drm_bridge_connector_init(struct drm_device *drm, struct drm_encoder *encoder); +struct drm_connector *drm_bridge_connector_dynamic_add(struct drm_device *drm, + struct drm_encoder *encoder); +void drm_bridge_connector_dynamic_remove(struct drm_connector *connector); #endif /* __DRM_BRIDGE_CONNECTOR_H__ */ -- 2.55.0