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 9F4B0CD5BA9 for ; Tue, 19 May 2026 10:39:39 +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=Hruhb1ZCQ/MBija+fhFHFu8qDzgA34c2IABg7xr74FQ=; b=23dN79jzp05brpejCs/nnrQ0Yo hrD8C0PeWb5cgz7ooUFqSilme9WUHUJmkgOf0nOki9/j1pMuLGIn9We9QjPYegVZ123jv4LfM7oFk nq9cmX11jU/J7AcjbvEKOIzyPlAYC5e6/RJ10owKv221hyn9PUrcq6ahYRIgHfabZIzgVoEg98rVR hPtaTCWcqWzNLuilraS6rQ0kKl4nKMw8kO3FmPNfWxBhgfPx6vaAkgWFXaqOSPz/XQE3icsXyhQX7 4aepLjqifRCx1t9wbDLPePxiV8GbN5XzgdPb1jOB4nIswBCiJl9OvGsRupsOLQ3GbgVFdXv6fS40g FbaNo5Ow==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wPHrH-000000018Wh-35Wx; Tue, 19 May 2026 10:39:31 +0000 Received: from smtpout-04.galae.net ([185.171.202.116]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wPHr8-000000018J8-1eqP for linux-arm-kernel@lists.infradead.org; Tue, 19 May 2026 10:39:26 +0000 Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-04.galae.net (Postfix) with ESMTPS id D9E23C2B9DB; Tue, 19 May 2026 10:40:13 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id A9D18606E9; Tue, 19 May 2026 10:39:20 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 8938E107E8AE7; Tue, 19 May 2026 12:39:14 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1779187158; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=Hruhb1ZCQ/MBija+fhFHFu8qDzgA34c2IABg7xr74FQ=; b=B8IVN01NRf+lvOHxqOAWPpYJOgdPVyJMoN+pKM3crUPNsOwQ6/0jMT/Ug4Nebna24uoapa mtDelWsbPRs9BYKYo8+M24XUYWPeBUDjJUvlGvhex4UeR6lRjMVjN9saKY2tZ9mEy15VVu lynCgYEA6tVoVMJm2bBGpMjQjEfVcE0tqyqpn+tpghSSy7kZeAN10ZTRFNNi6q0iDANvbx 1n641SLj8gnd8VgQ46kfjal6Z6sEJt1e7UFwyj3mRVLK+QbgjkR4xCR0OO/rmcVAOfVA5s WryYGacIJ8LUCHaIKH2+oKLeLKLaVzB0+qGE2E3MqGh0PqBOzbOjWTwDR0W3vg== From: Luca Ceresoli Date: Tue, 19 May 2026 12:37:34 +0200 Subject: [PATCH 17/37] drm/display: bridge-connector: protect dynconn creation and destruction with a mutex MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260519-drm-bridge-hotplug-v1-17-45e2bdb3dfb4@bootlin.com> References: <20260519-drm-bridge-hotplug-v1-0-45e2bdb3dfb4@bootlin.com> In-Reply-To: <20260519-drm-bridge-hotplug-v1-0-45e2bdb3dfb4@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 , Marek Vasut , Stefan Agner , Frank Li , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam Cc: Hui Pu , Ian Ray , 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 0.15.2 X-Last-TLS-Session-Version: TLSv1.3 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260519_033922_624082_EBFDF9E6 X-CRM114-Status: GOOD ( 11.71 ) 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 Bridge hotplug will make the connector dynamically created and destroyed based on hotplug events. In preparation for that, add a mutex to mutually exclude connector creation and destruction. Signed-off-by: Luca Ceresoli --- drivers/gpu/drm/display/drm_bridge_connector.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/gpu/drm/display/drm_bridge_connector.c b/drivers/gpu/drm/display/drm_bridge_connector.c index bd421b6beb7c..b83da529cc7a 100644 --- a/drivers/gpu/drm/display/drm_bridge_connector.c +++ b/drivers/gpu/drm/display/drm_bridge_connector.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -152,6 +153,11 @@ struct drm_bridge_connector { * @dynconn: The DRM connector added by the drm_bridge_connector */ struct drm_bridge_connector_dynconn *dynconn; + /** + * @dynconn_mutex: Protect @dynconn from concurrent creation and + * destruction + */ + struct mutex dynconn_mutex; }; static struct drm_bridge_connector_dynconn * @@ -810,6 +816,8 @@ static const struct drm_connector_hdmi_cec_funcs drm_bridge_connector_hdmi_cec_f static void drm_bridge_connector_dynconn_release(struct drm_bridge_connector *bridge_connector) { + guard(mutex)(&bridge_connector->dynconn_mutex); + if (!bridge_connector->dynconn) return; @@ -1050,6 +1058,8 @@ static int drm_bridge_connector_add_connector(struct drm_bridge_connector *bridg int connector_type; int ret; + guard(mutex)(&bridge_connector->dynconn_mutex); + struct drm_bridge_connector_dynconn *dynconn = kzalloc_obj(*dynconn); if (!dynconn) return -ENOMEM; @@ -1177,6 +1187,7 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm, if (!bridge_connector) return ERR_PTR(-ENOMEM); + mutex_init(&bridge_connector->dynconn_mutex); bridge_connector->drm = drm; bridge_connector->encoder = encoder; -- 2.54.0