Re: [PATCH 29/34] drm: zynqmp_dp: convert to devm_drm_bridge_alloc() API

From: Luca Ceresoli <luca.ceresoli@bootlin.com>
To: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Cc: "Anusha Srivatsa" <asrivats@redhat.com>,
	"Paul Kocialkowski" <paulk@sys-base.io>,
	"Dmitry Baryshkov" <lumag@kernel.org>,
	"Hervé Codina" <herve.codina@bootlin.com>,
	"Hui Pu" <Hui.Pu@gehealthcare.com>,
	"Thomas Petazzoni" <thomas.petazzoni@bootlin.com>,
	dri-devel@lists.freedesktop.org, asahi@lists.linux.dev,
	linux-kernel@vger.kernel.org, chrome-platform@lists.linux.dev,
	imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org,
	linux-amlogic@lists.infradead.org,
	linux-renesas-soc@vger.kernel.org,
	platform-driver-x86@vger.kernel.org,
	linux-samsung-soc@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	freedreno@lists.freedesktop.org,
	linux-stm32@st-md-mailman.stormreply.com,
	"Michal Simek" <michal.simek@amd.com>,
	"Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
	"Maxime Ripard" <mripard@kernel.org>,
	"Thomas Zimmermann" <tzimmermann@suse.de>,
	"David Airlie" <airlied@gmail.com>,
	"Simona Vetter" <simona@ffwll.ch>,
	"Andrzej Hajda" <andrzej.hajda@intel.com>,
	"Neil Armstrong" <neil.armstrong@linaro.org>,
	"Robert Foss" <rfoss@kernel.org>,
	"Laurent Pinchart" <Laurent.pinchart@ideasonboard.com>,
	"Jonas Karlman" <jonas@kwiboo.se>,
	"Jernej Skrabec" <jernej.skrabec@gmail.com>,
	"Jagan Teki" <jagan@amarulasolutions.com>,
	"Shawn Guo" <shawnguo@kernel.org>,
	"Sascha Hauer" <s.hauer@pengutronix.de>,
	"Pengutronix Kernel Team" <kernel@pengutronix.de>,
	"Fabio Estevam" <festevam@gmail.com>,
	"Douglas Anderson" <dianders@chromium.org>,
	"Chun-Kuang Hu" <chunkuang.hu@kernel.org>,
	"Krzysztof Kozlowski" <krzk@kernel.org>,
	"Dmitry Baryshkov" <dmitry.baryshkov@linaro.org>
Subject: Re: [PATCH 29/34] drm: zynqmp_dp: convert to devm_drm_bridge_alloc() API
Date: Thu, 24 Apr 2025 13:28:04 +0200	[thread overview]
Message-ID: <20250424132804.30bcc49a@booty> (raw)
In-Reply-To: <6b699329-8ed4-4be6-81bb-17b4bf800d34@ideasonboard.com>

Hello Tomi,

On Wed, 16 Apr 2025 15:31:41 +0300
Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> wrote:

> Hi,
> 
> On 07/04/2025 17:23, Luca Ceresoli wrote:
> > This is the new API for allocating DRM bridges.
> > 
> > This driver has a peculiar structure. zynqmp_dpsub.c is the actual driver,
> > which delegates to a submodule (zynqmp_dp.c) the allocation of a
> > sub-structure embedding the drm_bridge and its initialization, however it
> > does not delegate the drm_bridge_add(). Hence, following carefully the code
> > flow, it is correct to change the allocation function and .funcs assignment
> > in the submodule, while the drm_bridge_add() is not in that submodule.
> > 
> > Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>

[...]

> To add to my last mail, this clearly cannot be right, as it changes 
> kzalloc call to devm_* call, without removing the kfree()s...

Thank you very much for having tested this patch and found the mistake!
I have checked all other patches in the series and found no other
instance of this specific flaw, but a couple flaws of a different
nature. I'm now fixing all of them and will send v2 later today.

Luca

-- 
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

_______________________________________________
linux-amlogic mailing list
linux-amlogic@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-amlogic