From nobody Tue Dec 16 14:22:30 2025 Received: from relay6-d.mail.gandi.net (relay6-d.mail.gandi.net [217.70.183.198]) (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 845C919AD5C; Thu, 6 Feb 2025 18:15:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.198 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738865721; cv=none; b=JS+r6IrOx1nGlCui6DyVdr2l4vLPNgx7lFm+l2C6R3aoM6RHMjtC9RnBLdAzLL3495rP3FTA7+O+MZUnSFAioEZh9Y3qFYPSJHOQKg1pLGupQAezcQK6aezwuD3mOmt4fRKBOZWmZlNx42tIO0zi3I1aL70mg7XixqkqiUOY8iE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738865721; c=relaxed/simple; bh=j2lLEqPWYJBXr1/fO1Fv/1SBuN02VV2/FwH+c9njPD8=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=DXdU3PUL5L5JLHTxNTsnkuDy4OofmMzXiw6PYdY2POSxFDHCOB7wrFzyiau6csA0d96Zt8c3W8Lz3LmuUVq1QVkSKzIjB6FdXbjIBcziU7z3NK3arC5AXllBfAPlkBRr3Uw8VaYz845FLTlAupNZWsGEE6gaxOUVNM/VTlLeWkE= ARC-Authentication-Results: i=1; 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bh=nGVO+QbU0hs3mabM5lWL+R6oDUNoq4UxfAsW2GhkoGA=; b=DZ/1NcWug2cys6H/JNqGshU/Xo24P11YOh993tdanJxk9kvVnFe475NPxvy644vsLb1PxQ wMwSsJHTbaPq0eTPiBjNOzfBLFs2h27LXxtKsK8a2yUYWvLFB1C0G5JbmHrhKQVwTc47ci 2U9kF6U/XChUQn4GifaEgqdT9XXCkpPPfBYJVYTmjyE8uim/smB3dMqib28HMRiXl7lopS rQuz6SPtkxt0FmExvCi5u2hiG/EPtyZ3aDtCb2zerdVye0ceF3bEM4wAdGiU0s/jrQSHwf vWH8LewgF31ZkOGjE0rv882i4ucnJyW5i4kaOfzviMfo3wTuY0aTf8OumoNwhg== From: Luca Ceresoli Date: Thu, 06 Feb 2025 19:14:30 +0100 Subject: [PATCH v6 15/26] drm/bridge: devm_drm_of_get_bridge and drmm_of_get_bridge: automatically put the bridge 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: <20250206-hotplug-drm-bridge-v6-15-9d6f2c9c3058@bootlin.com> References: <20250206-hotplug-drm-bridge-v6-0-9d6f2c9c3058@bootlin.com> In-Reply-To: <20250206-hotplug-drm-bridge-v6-0-9d6f2c9c3058@bootlin.com> To: Simona Vetter , Inki Dae , Jagan Teki , Marek Szyprowski , Catalin Marinas , Will Deacon , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Daniel Thompson , Andrzej Hajda , Jonathan Corbet , Sam Ravnborg , Boris Brezillon , Nicolas Ferre , Alexandre Belloni , Claudiu Beznea , Jessica Zhang Cc: Paul Kocialkowski , Maxime Ripard , Dmitry Baryshkov , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Thomas Zimmermann , David Airlie , =?utf-8?q?Herv=C3=A9_Codina?= , Thomas Petazzoni , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Paul Kocialkowski , Luca Ceresoli X-Mailer: b4 0.14.2 X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgddvjedtkecutefuodetggdotefrodftvfcurfhrohhfihhlvgemucfitefpfffkpdcuggftfghnshhusghstghrihgsvgenuceurghilhhouhhtmecufedtudenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhephfffufggtgfgkfhfjgfvvefosehtjeertdertdejnecuhfhrohhmpefnuhgtrgcuvegvrhgvshholhhiuceolhhutggrrdgtvghrvghsohhlihessghoohhtlhhinhdrtghomheqnecuggftrfgrthhtvghrnhepieeiuedvffetgfeuudelheeutefggfejieettdetteekueeuueeukeevvedvueevnecukfhppedvrgdtvdemieejtdemvddtvddtmegvrgdtudemhegrgedtmedvughfieemrgdulegvmedutgejgeenucevlhhushhtvghrufhiiigvpedufeenucfrrghrrghmpehinhgvthepvdgrtddvmeeijedtmedvtddvtdemvggrtddumeehrgegtdemvdgufheimegrudelvgemudgtjeegpdhhvghloheplgduvdejrddtrddurddungdpmhgrihhlfhhrohhmpehluhgtrgdrtggvrhgvshholhhisegsohhothhlihhnrdgtohhmpdhnsggprhgtphhtthhopeefkedprhgtphhtthhopegtrghtrghlihhnrdhmrghrihhnrghssegrrhhmrdgtohhmpdhrtghpthhtohepshdrhhgruhgvrhesphgvnhhguhhtrhhonhhigidruggvpdhrtghpthhtoheprghlvgigrghnughrvgdrsggvlhhlohhnihessghoohhtlhhinhdrtghom hdprhgtphhtthhopegtlhgruhguihhurdgsvgiinhgvrgesthhugihonhdruggvvhdprhgtphhtthhopehmrdhsiiihphhrohifshhkihesshgrmhhsuhhnghdrtghomhdprhgtphhtthhopegtohhrsggvtheslhifnhdrnhgvthdprhgtphhtthhopehsihhmohhnrgesfhhffihllhdrtghhpdhrtghpthhtohepughrihdquggvvhgvlheslhhishhtshdrfhhrvggvuggvshhkthhophdrohhrgh X-GND-Sasl: luca.ceresoli@bootlin.com Add a devm/drmm action to these functions so the bridge reference is dropped automatically when the caller is removed. Signed-off-by: Luca Ceresoli --- This patch was added in v6. --- drivers/gpu/drm/drm_bridge.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c index f694b32ca59cb91c32846bc00b43360df41cc1ad..497ec06dfcb05ab5dee8ea5e8f1= eafb9c2807612 100644 --- a/drivers/gpu/drm/drm_bridge.c +++ b/drivers/gpu/drm/drm_bridge.c @@ -33,6 +33,7 @@ #include #include #include +#include #include #include =20 @@ -1459,6 +1460,13 @@ static int of_drm_find_bridge_by_endpoint(const stru= ct device_node *np, return ret; } =20 +static void devm_drm_bridge_put_void(void *data) +{ + struct drm_bridge *bridge =3D (struct drm_bridge *)data; + + drm_bridge_put(bridge); +} + /** * devm_drm_of_get_bridge - Return next bridge in the chain * @dev: device to tie the bridge lifetime to @@ -1469,6 +1477,10 @@ static int of_drm_find_bridge_by_endpoint(const stru= ct device_node *np, * Given a DT node's port and endpoint number, finds the connected node * and returns the associated bridge if any. * + * The refcount of the returned bridge is incremented, but the caller does + * not have to call drm_bridge_put() when done with the bridge. It will be + * done by devres when @dev is removed. + * * Returns a pointer to the bridge if successful, or an error pointer * otherwise. */ @@ -1483,6 +1495,10 @@ struct drm_bridge *devm_drm_of_get_bridge(struct dev= ice *dev, if (ret) return ERR_PTR(ret); =20 + ret =3D devm_add_action_or_reset(dev, devm_drm_bridge_put_void, bridge); + if (ret) + return ERR_PTR(ret); + return bridge; } EXPORT_SYMBOL(devm_drm_of_get_bridge); @@ -1497,6 +1513,10 @@ EXPORT_SYMBOL(devm_drm_of_get_bridge); * graph link search is not enough, e.g. for drivers that need to support * panels described only as subnodes. * + * The refcount of the returned bridge is incremented, but the caller does + * not have to call drm_bridge_put() when done with the bridge. It will be + * done by devres when @dev is removed. + * * RETURNS: * A pointer to the bridge if successful, or an error pointer otherwise. */ @@ -1513,10 +1533,21 @@ struct drm_bridge *devm_drm_of_get_bridge_by_node(s= truct device *dev, if (!bridge) return ERR_PTR(-ENODEV); =20 + ret =3D devm_add_action_or_reset(dev, devm_drm_bridge_put_void, bridge); + if (ret) + return ERR_PTR(ret); + return bridge; } EXPORT_SYMBOL(devm_drm_of_get_bridge_by_node); =20 +static void drmm_bridge_put_void(struct drm_device *drm, void *ptr) +{ + struct drm_bridge *bridge =3D ptr; + + drm_bridge_put(bridge); +} + /** * drmm_of_get_bridge - Return next bridge in the chain * @drm: device to tie the bridge lifetime to @@ -1527,6 +1558,10 @@ EXPORT_SYMBOL(devm_drm_of_get_bridge_by_node); * Given a DT node's port and endpoint number, finds the connected node * and returns the associated bridge if any. * + * The refcount of the returned bridge is incremented, but the caller does + * not have to call drm_bridge_put() when done with the bridge. It will be + * done by drmm when @dev is removed. + * * Returns a drmm managed pointer to the bridge if successful, or an error * pointer otherwise. */ @@ -1541,6 +1576,10 @@ struct drm_bridge *drmm_of_get_bridge(struct drm_dev= ice *drm, if (ret) return ERR_PTR(ret); =20 + ret =3D drmm_add_action_or_reset(drm, drmm_bridge_put_void, bridge); + if (ret) + return ERR_PTR(ret); + return bridge; } EXPORT_SYMBOL(drmm_of_get_bridge); --=20 2.34.1