From: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
The strict flag in struct pinmux_ops disallows the usage of the same pin
as a GPIO and for another function. Without it, a rouge user-space
process with enough privileges (or even a buggy driver) can request a
used pin as GPIO and drive it, potentially confusing devices or even
crashing the system. Set it globally for all pinctrl-msm users.
Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
---
drivers/pinctrl/qcom/pinctrl-msm.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
index a5f69464827119dfe2a7781b558094b283fca215..1751d838ce95d6138c824b90098f74891dec7656 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -268,6 +268,7 @@ static const struct pinmux_ops msm_pinmux_ops = {
.function_is_gpio = pinmux_generic_function_is_gpio,
.gpio_request_enable = msm_pinmux_request_gpio,
.set_mux = msm_pinmux_set_mux,
+ .strict = true,
};
static int msm_config_reg(struct msm_pinctrl *pctrl,
--
2.48.1
