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bh=AXCxhWG7+TwYnqcCH1bbu1V1drghoo3o25zXzfcMhR0=; b=fQE3MK2KKKWZHSHpw/EOuCoGF8aaQpjXtXTKgLDEfZFrVd71HsENBSa9zfQ935i/ZiAr6U Zue6+swKxKCX2qDuZq9nwmBMGmyS5hy0wrXRiEy7j9+DuCI8EayCfTLrQEKXCzayL8PyAm DIvVkcv6iGYmlD5D/SVxrhN8rYSBRiLHYKJ7Of8/y2mpjhdivQ6a/I5fagLrezCITdcn8U H1287RI3xWyRT7jN7LoiLS9M/k5XnJerLk8jLnTH5cZ/1SFEvOx00pz5RD+UGtiNuMPIfe pmWjg588UvmhPsWq/PrpI1EvEoMGJkFKXfCkgti73xrJJ7SwktiqsI1k/jCcZA== From: Luca Ceresoli Date: Wed, 25 Jun 2025 18:45:05 +0200 Subject: [PATCH 01/32] drm/mipi-dsi: add sanity check of lane number in mipi_dsi_attach() 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: <20250625-drm-dsi-host-no-device-ptr-v1-1-e36bc258a7c5@bootlin.com> References: <20250625-drm-dsi-host-no-device-ptr-v1-0-e36bc258a7c5@bootlin.com> In-Reply-To: <20250625-drm-dsi-host-no-device-ptr-v1-0-e36bc258a7c5@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 , Jani Nikula , Dmitry Baryshkov Cc: Hui Pu , Thomas Petazzoni , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-sunxi@lists.linux.dev, Luca Ceresoli X-Mailer: b4 0.14.2 X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeeffedrtddvgddvfedvkecutefuodetggdotefrodftvfcurfhrohhfihhlvgemucfitefpfffkpdcuggftfghnshhusghstghrihgsvgenuceurghilhhouhhtmecufedtudenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhephfffufggtgfgkfhfjgfvvefosehtjeertdertdejnecuhfhrohhmpefnuhgtrgcuvegvrhgvshholhhiuceolhhutggrrdgtvghrvghsohhlihessghoohhtlhhinhdrtghomheqnecuggftrfgrthhtvghrnhepieeiuedvffetgfeuudelheeutefggfejieettdetteekueeuueeukeevvedvueevnecukfhppedvrgdtvdemieejtdemvddtvddtmegvrgdtudemsggvgedumeelhegvjeemfeegfeemledufegvnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepvdgrtddvmeeijedtmedvtddvtdemvggrtddumegsvgegudemleehvgejmeefgeefmeeludefvgdphhgvlhhopegludelvddrudeikedrudejkedrjeehngdpmhgrihhlfhhrohhmpehluhgtrgdrtggvrhgvshholhhisegsohhothhlihhnrdgtohhmpdhnsggprhgtphhtthhopedvvddprhgtphhtthhopehjohhnrghssehkfihisghoohdrshgvpdhrtghpthhtohepthhhohhmrghsrdhpvghtrgiiiihonhhisegsohhothhlihhnrdgtohhmpdhrtghpthhtoheplhhinhhugidqshhunhigiheslhhishhtshdrlhhinhhugidruggvvhdpr hgtphhtthhopehmrdhsiiihphhrohifshhkihesshgrmhhsuhhnghdrtghomhdprhgtphhtthhopehrfhhoshhssehkvghrnhgvlhdrohhrghdprhgtphhtthhopehmrggrrhhtvghnrdhlrghnkhhhohhrshhtsehlihhnuhigrdhinhhtvghlrdgtohhmpdhrtghpthhtohepnhgvihhlrdgrrhhmshhtrhhonhhgsehlihhnrghrohdrohhrghdprhgtphhtthhopehjrghnihdrnhhikhhulhgrsehlihhnuhigrdhinhhtvghlrdgtohhm X-GND-Sasl: luca.ceresoli@bootlin.com Several drivers do some sanity checks on the lane number. Checking it is non-zero will allow to remove such checks. Additionally, we are about to move to an .attach_new host op which won't pass a pointer that the host driver can store. This will prevent host drivers to check for the presence of a device by storing such pointer and checking whether it is NULL. As a replacement, host drivers will be able to check the lane number to be non-zero, so ensuring a zero value is never passed along will make such checks robust. Signed-off-by: Luca Ceresoli --- drivers/gpu/drm/drm_mipi_dsi.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c index a00d76443128e4972f939a8c9e26d949d2b30bb9..82d4f9c1de5fbc60f32d0b0baf41e1bd2991ebe4 100644 --- a/drivers/gpu/drm/drm_mipi_dsi.c +++ b/drivers/gpu/drm/drm_mipi_dsi.c @@ -379,6 +379,9 @@ int mipi_dsi_attach(struct mipi_dsi_device *dsi) if (!ops || !ops->attach) return -ENOSYS; + if (dsi->lanes < 1) + return dev_err_probe(&dsi->dev, -EINVAL, "Incorrect lanes number\n"); + ret = ops->attach(dsi->host, dsi); if (ret) return ret; -- 2.49.0