linux-hardening - [PATCH 17/25] drivers: gpio: rda: Make direction register unreadable

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Message-Id: <20250917-rda8810pl-drivers-v1-17-9ca9184ca977@mainlining.org>
Date: Wed, 17 Sep 2025 03:25:14 +0700
From: Dang Huynh via B4 Relay <devnull+dang.huynh.mainlining.org@...nel.org>
To: Manivannan Sadhasivam <mani@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, 
 Alexandre Belloni <alexandre.belloni@...tlin.com>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, Philipp Zabel <p.zabel@...gutronix.de>, 
 Sebastian Reichel <sre@...nel.org>, Vinod Koul <vkoul@...nel.org>, 
 Kees Cook <kees@...nel.org>, "Gustavo A. R. Silva" <gustavoars@...nel.org>, 
 Ulf Hansson <ulf.hansson@...aro.org>
Cc: linux-arm-kernel@...ts.infradead.org, linux-unisoc@...ts.infradead.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-gpio@...r.kernel.org, linux-rtc@...r.kernel.org, 
 linux-clk@...r.kernel.org, linux-pm@...r.kernel.org, 
 dmaengine@...r.kernel.org, linux-hardening@...r.kernel.org, 
 linux-mmc@...r.kernel.org, Dang Huynh <dang.huynh@...nlining.org>
Subject: [PATCH 17/25] drivers: gpio: rda: Make direction register
 unreadable

From: Dang Huynh <dang.huynh@...nlining.org>

The register doesn't like to be read, this causes the SD Card
Card Detect GPIO to misbehaves in the OS.

Signed-off-by: Dang Huynh <dang.huynh@...nlining.org>
---
 drivers/gpio/gpio-rda.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-rda.c b/drivers/gpio/gpio-rda.c
index b4db8553a2371ae407fdb7e681d0f82c4d9f74b7..56aaa9f33d29469dfb1bf86ed7b63c54b413c89c 100644
--- a/drivers/gpio/gpio-rda.c
+++ b/drivers/gpio/gpio-rda.c
@@ -245,7 +245,7 @@ static int rda_gpio_probe(struct platform_device *pdev)
 		.clr = rda_gpio->base + RDA_GPIO_CLR,
 		.dirout = rda_gpio->base + RDA_GPIO_OEN_SET_OUT,
 		.dirin = rda_gpio->base + RDA_GPIO_OEN_SET_IN,
-		.flags = BGPIOF_READ_OUTPUT_REG_SET,
+		.flags = BGPIOF_READ_OUTPUT_REG_SET | BGPIOF_UNREADABLE_REG_DIR,
 	};

 	ret = gpio_generic_chip_init(&rda_gpio->chip, &config);

-- 
2.51.0