From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtpout-03.galae.net (smtpout-03.galae.net [185.246.85.4]) (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 3C37B4CA29D for ; Tue, 19 May 2026 10:39:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.246.85.4 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779187164; cv=none; b=mbNffsooWKRQm4+6D008Yt3u+HaTt8e4qTqp+qwWym0t53xNGnLqUlsh4NVf5lstP7yYfTNoG9dmarikGYvKQD8qJd1yWAFgSEKU4fIyrHwSLHPvPdCU63IEVwF7cBK+am2TWQU9ZX4as7su8proLynj+V9Xedw8Tk8toiBzCz0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779187164; c=relaxed/simple; bh=6tZr755GEhwo/7aN3+ctTOpQ+AiSu4iO5zIwvlPSnOs=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=WLKulOqPwBa1T706wiLQ5nnlN93bPs7Xe3cj4xUYEyUbhH54T1Bo19Zr8RWh9fhE0zHkSgABMQ4/+xxhBWzC9C7R+EPiYDYtGDvjok4QoQ5218Ya3likiB6zdNCZY/uOLxkKxBGjvGsANA0qi5LJoc3mnkke+Ord8eIuYjo63Kg= 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=B8IVN01N; arc=none smtp.client-ip=185.246.85.4 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="B8IVN01N" Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-03.galae.net (Postfix) with ESMTPS id E22854E42CF1; Tue, 19 May 2026 10:39:20 +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 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: 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 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