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

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Message-ID: <CAMRc=MeHQf_Oa2DRR0T7tum-Tuk3qPh5r5gimxGY3EXTyvoKZQ@mail.gmail.com>
Date: Wed, 17 Sep 2025 04:00:03 -0400
From: Bartosz Golaszewski <brgl@...ev.pl>
To: dang.huynh@...nlining.org
Cc: Dang Huynh via B4 Relay <devnull+dang.huynh.mainlining.org@...nel.org>, 
	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, 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>
Subject: Re: [PATCH 17/25] drivers: gpio: rda: Make direction register unreadable

On Tue, 16 Sep 2025 22:25:14 +0200, Dang Huynh via B4 Relay
<devnull+dang.huynh.mainlining.org@...nel.org> said:
> 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.
>

Hi!

Sorry but this message is unintelligible, please say precisely what is going
on and why you need this and why it won't break existing users.

Also: the title should be "gpio: rda: ...".

Bartosz

> 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
>
>
>